CN215414978U

CN215414978U - Multi-parameter automatic analyzer for different nitrogen forms in water

Info

Publication number: CN215414978U
Application number: CN202120464973.6U
Authority: CN
Inventors: 孙国伟; 段朝悦
Original assignee: Beijing Baode Instrument Co ltd
Current assignee: Beijing Baode Instrument Co ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2022-01-04
Anticipated expiration: 2031-03-04

Abstract

The automatic analyzer comprises an automatic sample injector, a solution conveying part, a chemical reaction part and a detector, wherein the automatic sample injector is used for absorbing liquid to be detected, the solution conveying part is used for conveying the liquid to be detected, current-carrying, potassium metabisulfite, potassium persulfate/boric acid, a complexing agent, a buffer solution and a color developing agent to the chemical reaction part respectively, the chemical reaction part is used for mixing the liquid to be detected, the current-carrying, potassium metabisulfite, potassium persulfate/boric acid, the complexing agent, the buffer solution and the color developing agent in sequence to obtain a mixed solution, and inputting the mixed solution into the detector, and the detector is used for detecting the absorbance of the mixed solution. The multi-parameter automatic analyzer for different nitrogen forms in water can continuously and automatically test samples. The multi-parameter automatic analyzer for different nitrogen forms in water can detect total nitrogen, nitrate and nitrite in water, has high test speed, high test sensitivity, good accuracy and simple and convenient operation, and is beneficial to saving cost for users.

Description

Multi-parameter automatic analyzer for different nitrogen forms in water

Technical Field

The utility model relates to a material analysis by an optical means, and mainly relates to a multi-parameter automatic analyzer for different nitrogen forms in water.

Background

Total nitrogen is defined as the total amount of various forms of inorganic and organic nitrogen, including NO, in the water₃ ^-、NO₂ ^-And NH₄ ⁺Inorganic nitrogen and organic nitrogen such as protein, amino acid and organic amine are one of important indexes for measuring water quality calculated by nitrogen-containing milligrams in each liter of water, and are often used for indicating the degree of pollution of water bodies by nutrient substances.

Nitrate (NO)₃ ^-) With Nitrite (NO)₂ ^-) Is an important component of total nitrogen. Nitrate is easily reduced to nitrite under the action of microorganisms in human bodies. The nitrite salt being N^-Precursor of nitroso compound has strong carcinogenic effect on human body. Nitrites are widely found in nature as environmental pollutants, especially in gaseous, surface and ground waters, as well as in animal and plant bodies and food products. Therefore, the use of nitrate is strictly controlled by the nation, and the content of nitrate is an index which must be measured by drinking water.

In recent years, the content of total nitrogen, nitrate and nitrite in water is also listed as an index which is necessary to be measured in industries such as environmental protection and the like, and the number of samples to be measured is larger.

The flow analysis technology is used for detecting total nitrogen, nitrate and nitrite in fresh water for a long time, but the existing related analysis equipment can only detect one index, and if a plurality of indexes are detected, a plurality of pieces of equipment are needed, so that the use is inconvenient, and the user investment is large, so that an automatic analyzer with multiple parameters and different nitrogen forms in water, which can integrate the detection of the total nitrogen, the nitrate and the nitrite in the water, is urgently needed to solve the defects.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multi-parameter automatic analyzer for different nitrogen forms in water.

The automatic analyzer comprises an automatic sample injector, a solution conveying part, a chemical reaction part and a detector, wherein the automatic sample injector is connected with the solution conveying part through a pipeline, the solution conveying part is connected with the chemical reaction part through a pipeline, the automatic sample injector is used for sucking liquid to be detected, the solution conveying part is used for conveying the liquid to be detected, current carrying, potassium metabisulfite, potassium persulfate/boric acid, a complexing agent, a buffer solution and a color developing agent to the chemical reaction part respectively, the chemical reaction part is used for mixing the liquid to be detected, the current carrying, the potassium metabisulfite, the potassium persulfate/boric acid, the complexing agent, the buffer solution and the color developing agent in sequence to obtain a mixed solution, and inputting the mixed solution into the detector, and the detector is used for detecting the absorbance of the mixed solution.

The utility model relates to an automatic analyzer for multiparameters of different nitrogen forms in water, wherein an automatic sample injector comprises a sample tray for supporting test tubes, a first motor for driving the sample tray to rotate, an output shaft of the first motor is connected with a rotating shaft of the sample tray, a plurality of round holes for placing the test tubes are arranged on the sample tray, the test tubes for respectively containing samples and standard solutions are respectively inserted into the round holes, the automatic sample injector also comprises a sample injection needle capable of being inserted into the test tube and a second motor for driving the sample injection needle to move up and down, an output end of the second motor is connected with the sample injection needle, the second motor and the sample injection needle are arranged on a sample injection arm, the sample injection arm is connected with an output shaft of a third motor, the third motor is used for driving the sample injection arm to rotate and swing above the sample tray so that the sample injection needle can enter a selected test tube, the outer end of the sample injection needle is connected with the solution conveying part through a pipeline.

The utility model relates to an automatic analyzer for multiple parameters of different nitrogen forms in water, wherein a solution conveying part comprises a peristaltic pump, and the peristaltic pump is used for conveying liquid in a sample peristaltic pump pipe, a current-carrying peristaltic pump pipe, a potassium metabisulfite peristaltic pump pipe, a potassium persulfate/boric acid peristaltic pump pipe, a complexing agent peristaltic pump pipe, a buffer solution peristaltic pump pipe and a color developing agent peristaltic pump pipe;

the chemical reaction part comprises an electric multi-position valve, the electric multi-position valve comprises a valve shell and a valve core, a D interface, an E interface, an F interface, a G interface, an H interface and an I interface are arranged on the valve shell, a first channel, a second channel and a third channel are rotatably arranged in the valve core, the first channel is used for enabling the D interface to be communicated with the E interface or enabling the D interface to be communicated with the I interface, the second channel is used for enabling the E interface to be communicated with the F interface or enabling the F interface to be communicated with the G interface, and the third channel is used for enabling the G interface to be communicated with the H interface or enabling the H interface to be communicated with the I interface;

one end of the sample peristaltic pump tube is connected with a sample injection needle of the automatic sample injector through a capillary connecting tube, and the other end of the sample peristaltic pump tube is in liquid communication with an M interface of the first four-way valve through the capillary connecting tube;

one end of the current-carrying peristaltic pump tube is in liquid communication with the current-carrying bottle through a capillary connecting tube, and the other end of the current-carrying peristaltic pump tube is in liquid communication with a G interface of the electric multi-position valve through a capillary connecting tube;

one end of the potassium metabisulfite pump pipe is in liquid communication with the sodium metabisulfite bottle through a capillary connecting pipe, and the other end of the potassium metabisulfite pump pipe is in liquid communication with an A interface of the first tee joint through a capillary connecting pipe;

one end of the potassium persulfate/boric acid pump pipe is communicated with the liquid in the potassium persulfate/boric acid bottle through a capillary connecting pipe, and the other end of the potassium persulfate/boric acid pump pipe is communicated with the A interface liquid of the second tee joint through the capillary connecting pipe;

one end of the complexing agent peristaltic pump tube is communicated with the complexing agent bottle through a capillary connecting tube, and the other end of the complexing agent peristaltic pump tube is communicated with the liquid at the port B of the third tee joint through the capillary connecting tube;

one end of the buffer solution peristaltic pump tube is in liquid communication with the buffer solution bottle through a capillary connecting tube, and the other end of the buffer solution peristaltic pump tube is in liquid communication with a port B of the fourth tee joint through a capillary connecting tube;

one end of the color developing agent peristaltic pump tube is communicated with the color developing agent bottle liquid through a capillary connecting tube, and the other end of the color developing agent peristaltic pump tube is communicated with the B interface liquid of the fifth tee joint through the capillary connecting tube;

one end of the sample ring is in liquid communication with an E interface of the electric multi-position valve, and the other end of the sample ring is in liquid communication with an H interface of the electric multi-position valve;

the D interface of the electric multi-position valve is communicated with the waste liquid bottle through a capillary connecting pipe;

an F interface of the electric multi-position valve is in liquid communication with one end of the second winding reaction tube through a capillary connecting tube;

the I interface of the electric multi-position valve is in liquid communication with the S interface of the degassing module through a capillary connecting pipe;

the J interface of the first four-way valve is communicated with the B interface of the second tee joint through a capillary connecting pipe;

a K interface of the first four-way valve is communicated with one end of the first winding reaction tube through a capillary connecting tube;

the L interface of the first four-way valve is connected with the R interface of the degassing module through a capillary connecting pipe;

a J interface of the second four-way valve is connected with an N interface of the cadmium column through a capillary connecting pipe, and a K interface of the second four-way valve is communicated with an O interface of the cadmium column through the capillary connecting pipe;

an L interface of the second four-way valve is communicated with an A interface of the fifth tee joint through a capillary connecting pipe, and an M interface of the second four-way valve is communicated with one end of a fourth winding reaction pipe through the capillary connecting pipe;

the P interface of the degassing module is blocked by a dead plug, and the Q interface of the degassing module is connected to the waste liquid bottle by a capillary connecting pipe;

one end of a sixth winding reaction tube in the heating module is communicated with a port C of the second tee joint through a capillary connecting tube, and the other end of the sixth winding reaction tube is communicated with a port B of the first tee joint through a capillary connecting tube;

one end of a seventh winding reaction tube in the ultraviolet digestion device is communicated with an interface A of the first tee joint through a capillary connecting tube, and the other end of the seventh winding reaction tube is communicated with an interface B of the first tee joint;

an interface A of the first tee joint is connected with a sodium metabisulfite pump pipe through a capillary connecting pipe, an interface B of the first tee joint is communicated with the other end of a seventh winding reaction pipe in the ultraviolet digestion device, and an interface C is communicated with the other end of the first winding reaction pipe through the capillary connecting pipe;

the interface A of the second tee joint is connected with a potassium persulfate/boric acid pump pipe through a capillary connecting pipe, and the interface B of the second tee joint is connected with the interface J of the first four-way valve through a capillary connecting pipe;

the interface A of the third tee joint is communicated with the other end of the second winding reaction tube through a capillary connecting tube, and the interface C of the third tee joint is connected with one end of the third winding reaction tube through a capillary connecting tube;

the interface A of the fourth tee joint is connected with the other end of the third winding reaction tube through a capillary connecting tube, and the interface C of the fourth tee joint is communicated with the other end of the fourth winding reaction tube through a capillary connecting tube;

the C interface of the fifth tee joint is communicated with one end of a fifth winding reaction tube through a capillary connecting tube; the other end of the fifth winding reaction tube is communicated with an interface A of the second two-way tube through a capillary connecting tube;

one end of the first back pressure pipe is connected with an O interface of the degassing module, and the other end of the first back pressure pipe is communicated with the waste liquid bottle;

one end of the second back pressure pipe is connected with a D interface of the electric multi-position valve, and the other end of the second back pressure pipe is connected with the waste liquid bottle;

one end of the third back pressure pipe is connected with the outlet of the flow cell, and the other end of the third back pressure pipe is connected with the waste liquid bottle;

the interface B of the second two-way is connected with the inlet of the flow cell through a capillary connecting pipe, and the outlet of the flow cell is communicated with the waste liquid bottle through the capillary connecting pipe;

the flow cell is placed in a detector, and the detector is used for detecting the absorbance of the mixed solution in the flow cell.

The multi-parameter automatic analyzer for different nitrogen forms in water further comprises a data processing workstation, wherein the data processing workstation is connected with the detector so as to process detected data.

The utility model relates to an automatic analyzer for multiple parameters of different nitrogen forms in water, wherein the lengths of a first winding reaction tube, a second winding reaction tube, a third winding reaction tube, a fourth winding reaction tube and a seventh winding reaction tube for ultraviolet digestion are 1-3m, the lengths of a fifth winding reaction tube and a sixth winding reaction tube for heating reaction are 1-5m, and the inner diameter is 0.3-1.5 mm.

The utility model relates to a multiparameter automatic analyzer for different nitrogen forms in water, wherein the lengths of a first backpressure pipe, a second backpressure pipe and a third backpressure pipe are 1-5m, and the inner diameter is 0.3-1.0 mm.

The utility model relates to a multi-parameter automatic analyzer for different nitrogen forms in water, wherein the length of a capillary connecting pipe is 0.1-1m, the inner diameter of the capillary connecting pipe is 0.3-1.0mm, the length of a sample ring is 1-5m, and the inner diameter of the sample ring is 0.3-1.0 mm.

The utility model relates to an automatic analyzer for multiple parameters of different nitrogen forms in water, wherein the inner diameters of a sample peristaltic pump tube, a current-carrying peristaltic pump tube, a sodium metabisulfite peristaltic pump tube, a potassium persulfate/boric acid peristaltic pump tube, a complexing agent peristaltic pump tube, a buffer solution peristaltic pump tube and a color developing agent peristaltic pump tube are 0.38-1.52 mm.

The multi-parameter automatic analyzer for different nitrogen forms in water can continuously and automatically test samples. The multi-parameter automatic analyzer for different nitrogen forms in water can detect total nitrogen, nitrate and nitrite in water, has high test speed, high test sensitivity, good accuracy and simple and convenient operation, and is beneficial to saving cost for users.

Drawings

FIG. 1 is a schematic structural diagram of a multi-parameter automatic analyzer for different nitrogen forms in water according to the present invention.

Detailed Description

As shown in FIG. 1, the multi-parameter automatic analyzer for different nitrogen forms in water of the present invention comprises an automatic sample injector, a solution delivery part, a chemical reaction part, and a detector 3, the automatic sample injector is connected with the solution conveying part through a pipeline, the solution conveying part is connected with the chemical reaction part through a pipeline, the automatic sample injector is used for absorbing liquid to be detected, the solution conveying part is used for conveying the liquid to be detected, current carrying, potassium metabisulfite, potassium persulfate/boric acid, complexing agent, buffer solution and color developing agent to the chemical reaction part respectively, the chemical reaction part is used for mixing liquid to be detected, current-carrying, potassium metabisulfite, potassium persulfate/boric acid, a complexing agent, a buffer solution and a color developing agent in sequence to obtain a mixed solution, and inputting the mixed solution into a detector, wherein the detector is used for detecting the absorbance of the mixed solution.

The utility model relates to an automatic analyzer for multiparameters of different nitrogen forms in water, wherein an automatic sample injector comprises a sample tray 1 for bearing test tubes, a first motor 44 for driving the sample tray to rotate, an output shaft of the first motor is connected with a rotating shaft of the sample tray, a plurality of round holes 46 for placing the test tubes are arranged on the sample tray, test tubes 35 for respectively containing samples and standard solutions are respectively inserted into the round holes, the automatic sample injector also comprises a sample injection needle 36 capable of being inserted into the test tubes and a second motor for driving the sample injection needle to move up and down, an output end of the second motor is connected with the sample injection needle, the second motor and the sample injection needle are arranged on a sample injection arm 45, the sample injection arm is connected with an output shaft of a third motor, and the third motor is used for driving the sample injection arm to rotate and swing above the sample tray so that the sample injection needle can enter a selected test tube, the outer end of the sample injection needle is connected with the solution conveying part through a pipeline.

The utility model relates to an automatic analyzer for multiple parameters of different nitrogen forms in water, wherein a solution conveying part comprises a peristaltic pump 2, and the peristaltic pump is used for conveying liquid in a sample peristaltic pump pipe, a current-carrying peristaltic pump pipe, a potassium metabisulfite peristaltic pump pipe, a potassium persulfate/boric acid peristaltic pump pipe, a complexing agent peristaltic pump pipe, a buffer solution peristaltic pump pipe and a color developing agent peristaltic pump pipe;

the chemical reaction part comprises an electric multi-position valve 6, the electric multi-position valve comprises a valve shell and a valve core, a D interface, an E interface, an F interface, a G interface, an H interface and an I interface are arranged on the valve shell, a first channel, a second channel and a third channel are rotatably arranged in the valve core, the first channel is used for enabling the D interface to be communicated with the E interface or enabling the D interface to be communicated with the I interface, the second channel is used for enabling the E interface to be communicated with the F interface or enabling the F interface to be communicated with the G interface, and the third channel is used for enabling the G interface to be communicated with the H interface or enabling the H interface to be communicated with the I interface;

an interface A of the first tee joint is connected with a sodium metabisulfite pump pipe through a capillary connecting pipe, an interface B of the first tee joint is communicated with the other end of a seventh winding reaction pipe in the ultraviolet digestion, and an interface C is communicated with the other end of the first winding reaction pipe through the capillary connecting pipe;

The utility model discloses a multi-parameter automatic analyzer for detecting different nitrogen forms in water, which integrates detection of total nitrogen, nitrate and nitrite in water.

The electric multi-position valve has at least six interfaces and has two states; the first state is a sample loading state, and the second state is a sample injection state. The four-way valve is provided with four interfaces and has two working states, and the four-way valve is mainly used for switching between different modules in the patent.

The multi-parameter automatic analyzer for different nitrogen forms in water can continuously and automatically test samples, and the test speed is up to 35-90 samples/h; the test sensitivity is high, and the linear range is 10 mu g N/L-2000 mu g N/L; the detection limit can be as low as 2.0 mu g N/L (total nitrogen), 0.2 mu g/L (nitrate) and 0.1 mu g/L (nitrite); the accuracy is good; high precision and good repeatability.

The utility model relates to a multi-parameter automatic analyzer for different nitrogen forms in water, which comprises an automatic sample injector, a solution conveying part, a chemical reaction part, a detector and a data processing workstation.

The solution conveying part comprises a peristaltic pump, a sample peristaltic pump pipe, a current-carrying peristaltic pump pipe, a sodium metabisulfite peristaltic pump pipe, a potassium persulfate/boric acid peristaltic pump pipe, a complexing agent peristaltic pump pipe, a buffer solution peristaltic pump pipe and a color developing agent peristaltic pump pipe.

The chemical reaction part comprises an electric multi-position valve, a first winding reaction tube, a second winding reaction tube, a third winding reaction tube, a fourth winding reaction tube, a fifth winding reaction tube, a sixth winding reaction tube, a seventh winding reaction tube, a cadmium column, a first four-way valve, a second four-way valve, a degassing module, a heating module, an ultraviolet digestion device, a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve, a first two-way valve, a second two-way valve, a capillary connecting tube, a sample ring, a reagent bottle, a flow cell, a first back pressure tube, a second back pressure tube and a third back pressure tube.

The reagent bottles comprise a current carrying bottle, a sodium metabisulfite bottle, a potassium persulfate/boric acid bottle, a complexing agent bottle, a buffer solution bottle, a color developing agent bottle and a waste liquid bottle;

the electric multi-position valve is provided with at least six interfaces which are respectively a D interface, an E interface, an F interface, a G interface, an H interface and an I interface;

one end of the potassium persulfate/boric acid pump pipe is communicated with the liquid in the potassium persulfate/boric acid bottle through a capillary connecting pipe, and the other end of the potassium persulfate/boric acid pump pipe is communicated with the A port of the second tee joint through a capillary connecting pipe;

one end of the complexing agent peristaltic pump tube is in liquid communication with the complexing agent bottle through a capillary connecting tube, and the other end of the complexing agent peristaltic pump tube is in liquid communication with a port B of the third tee joint through a capillary connecting tube;

one end of the buffer solution peristaltic pump tube is in liquid communication with the buffer solution bottle through a capillary connecting tube, and the other end of the buffer solution peristaltic pump tube is in liquid communication with a port B of the fourth tee through a capillary connecting tube;

one end of the color developing agent peristaltic pump tube is in liquid communication with the color developing agent bottle through a capillary connecting tube, and the other end of the color developing agent peristaltic pump tube is in liquid communication with a port B of the fifth tee joint through a capillary connecting tube;

one end of the sample ring is in liquid communication with an E port of the electric multi-position valve, and the other end of the sample ring is in liquid communication with an H port of the electric multi-position valve;

the D interface of the electric multi-position valve is in liquid communication with the waste liquid bottle through a capillary connecting pipe;

an L interface of the second four-way valve is communicated with an A interface of the fifth tee joint through a capillary connecting pipe, and an M interface of the second four-way valve is communicated with one end of the fourth winding reaction pipe through a capillary connecting pipe;

one end of a sixth winding reaction tube in the heating module is communicated with a port C of the second tee joint through a capillary connecting tube, and the other end of the sixth winding reaction tube is communicated with a port B of the first second tee joint through a capillary connecting tube;

an interface A of the first tee joint is connected with the sodium metabisulfite pump pipe through a capillary connecting pipe, an interface B of the first tee joint is communicated with the other end of a seventh winding reaction pipe in the ultraviolet digestion device, and an interface C of the first tee joint is communicated with the other end of the first winding reaction pipe through a capillary connecting pipe;

the interface A of the second tee joint is connected with the potassium persulfate/boric acid pump pipe through a capillary connecting pipe, and the interface B of the second tee joint is connected with the interface J of the first four-way valve through a capillary connecting pipe;

the A interface of the third tee joint is communicated with the other end of the second winding reaction tube through a capillary connecting tube, and the C interface of the third tee joint is connected with one end of the third winding reaction tube through a capillary connecting tube;

the C interface of the fifth tee joint is communicated with one end of the fifth winding reaction tube through a capillary connecting tube; the other end of the fifth winding reaction tube is communicated with an interface A of the second two-way through a capillary connecting tube;

the interface B of the second two-way is connected with the inlet of the flow cell through a capillary connecting pipe, and the outlet of the flow cell is in liquid communication with the waste liquid bottle through the capillary connecting pipe;

the flow cell is placed in a detector, and the detector is used for detecting the absorbance of the mixed solution in the flow cell. The data processing workstation is connected with the detector to process the data detected by the data processing workstation.

The electric multi-position valve has two states: the first state is a sample loading state, wherein the interface D is communicated with the interface E, the interface F is communicated with the interface G, and the interface H is communicated with the interface I; the second state is a sample injection state, wherein the interface D is communicated with the interface I, the interface E is communicated with the interface F, and the interface G is communicated with the interface H.

The four-way valve has two connection states: the first state is that the J interface is communicated with the K interface, and the L interface is communicated with the M interface; and in the second state, the J interface is communicated with the M interface, and the K interface is communicated with the L interface.

The carrier flow is water, the pH value of the buffer solution is 7-9, and the buffer solution is prepared by mixing hydrochloric acid and ammonia water.

The color developing agent is a phosphoric acid mixed solution of 30-50g/L sulfanilamide and 0.1-2g/L naphthyl ethylenediamine hydrochloride.

The complexing agent is prepared by dissolving 0.1-0.8g of EDTA and 1-10g of sodium hydroxide in 1L of water.

The sodium metabisulfite is prepared by dissolving 1-8g of sodium metabisulfite in 1L of water.

The potassium persulfate/boric acid is prepared by dissolving 5-15g of potassium persulfate and 1-10g of sodium tetraborate in 1L of water.

The utility model relates to a multi-parameter automatic analyzer integrating detection of total nitrogen, nitrate and nitrite in water. The multi-parameter automatic analyzer for different nitrogen forms in water uses a flow injection colorimetric method to measure total nitrogen, nitrate and nitrite in water.

The multi-parameter automatic analyzer for different forms of nitrogen in water integrates detection of total nitrogen, nitrate and nitrite in water, has high sensitivity and accuracy, meets the requirements of national standards such as underground water quality standard GB/T14848-93, sanitary standard for drinking water (GB5749-2006), surface water environment quality standard (GB 3838-2002) and the like, and has the advantages of simple operation, high analysis speed and high precision.

The multi-parameter automatic analyzer for different nitrogen forms in water has the following beneficial effects:

the multi-parameter automatic analyzer for different nitrogen forms in water can continuously and automatically test samples, the testing speed is high, the sample testing frequency is 35-90 samples/hour, and the detection efficiency of total nitrogen, nitrate and nitrite in water is improved; the test sensitivity is high, and the linear range is 10 mu g N/L-2000 mu gN/L (total nitrogen), 10 mu g/L-1000 mu g/L (nitrate), 10 mu g/L-2000 mu g/L (nitrite); the detection limit can be as low as 2.0 mu g N/L (total nitrogen), 0.2 mu g/L (nitrate) and 0.1 mu g/L (nitrite); the method has the advantages of good accuracy, high precision and good repeatability, and completely meets the requirements of national standards such as underground water quality standard GB/T14848-93, sanitary standards for drinking water (GB5749-2006), surface water environmental quality standard (GB 3838-.

The utility model relates to a multi-parameter automatic analyzer for different nitrogen forms in water, which comprises an automatic sample injector, a solution conveying part, a chemical reaction part, a detector 3 and a data processing workstation 4.

The solution conveying part comprises a peristaltic pump 2, and the peristaltic pump is used for conveying liquid in a sample peristaltic pump pipe 39, a current-carrying peristaltic pump pipe 40, a sodium metabisulfite pump pipe 37, a potassium persulfate/boric acid pump pipe 38, a complexing agent peristaltic pump pipe 41, a buffer solution peristaltic pump pipe 42 and a color developing agent peristaltic pump pipe 43.

The chemical reaction part comprises an electric multi-position valve 6, a first winding reaction tube 20, a second winding reaction tube 21, a third winding reaction tube 22, a fourth winding reaction tube 23, a fifth winding reaction tube 24, a sixth winding reaction tube 25, a seventh winding reaction tube 26, a cadmium column 9, a first four-way valve 7, a second four-way valve 8, a degassing module 10, a heating module 11, an ultraviolet digestion device 12, a first tee 13, a second tee 14, a third tee 15, a fourth tee 16, a fifth tee 17, a first two-way valve 18, a second two-way valve 19, a capillary connecting tube, a sample ring 34, a reagent bottle, a flow cell 5, a first back pressure tube 47, a second back pressure tube 48 and a third back pressure tube 49;

the reagent bottles comprise a carrying flow bottle 30, a sodium metabisulfite bottle 28, a potassium persulfate/boric acid bottle 29, a complexing agent bottle 31, a buffer solution bottle 32, a color developing agent bottle 33 and a waste liquid bottle 27.

The electric multi-position valve 6 is provided with at least six interfaces which are respectively a D interface, an E interface, an F interface, a G interface, an H interface and an I interface. The electric multi-position valve 6 has two states: the first state is a sample loading state, wherein the interface D is communicated with the interface E, the interface F is communicated with the interface G, and the interface H is communicated with the interface I; the second state is a sample injection state, wherein the interface D is communicated with the interface I, the interface E is communicated with the interface F, and the interface G is communicated with the interface H.

One end of a sample peristaltic pump tube 39 is connected with a sample injection needle 36 of the automatic sample injector through a capillary connecting tube, and the other end is in liquid communication with an M interface of the first four-way valve 7 through the capillary connecting tube;

one end of the current-carrying peristaltic pump tube 40 is in liquid communication with the current-carrying bottle 30 through a capillary connecting tube, and the other end of the current-carrying peristaltic pump tube is in liquid communication with a G interface of the electric multi-position valve 6 through a capillary connecting tube;

one end of the potassium metabisulfite pump pipe 37 is in liquid communication with the sodium metabisulfite bottle 28 through a capillary connection pipe, and the other end is in liquid communication with an interface A of the first tee joint 13 through a capillary connection pipe;

one end of the potassium persulfate/boric acid pump pipe 38 is in fluid communication with the liquid in the potassium persulfate/boric acid bottle 29 through a capillary connection pipe, and the other end is in fluid communication with the interface A of the second tee joint 14 through a capillary connection pipe;

one end of a complexing agent peristaltic pump tube 41 is in liquid communication with the complexing agent bottle 31 through a capillary connecting tube, and the other end of the complexing agent peristaltic pump tube is in liquid communication with a port B of the third tee 15 through a capillary connecting tube;

one end of the buffer solution peristaltic pump tube 42 is in liquid communication with the buffer solution bottle 32 through a capillary connection tube, and the other end is in liquid communication with the interface B of the fourth tee 16 through a capillary connection tube;

one end of the color reagent peristaltic pump tube 43 is in liquid communication with the color reagent bottle 33 through a capillary connecting tube, and the other end is in liquid communication with the interface B of the fifth tee joint 17 through a capillary connecting tube;

one end of the sample loop 34 is in fluid communication with the E port of the electric multi-position valve 6 and the other end is in fluid communication with the H port of the electric multi-position valve 6;

the D interface of the electric multi-position valve 6 is in liquid communication with the waste liquid bottle 27 through a capillary connecting pipe;

the F interface of the electric multi-position valve 6 is in liquid communication with one end of the second winding reaction tube 21 through a capillary connecting tube;

the interface I of the electric multi-position valve 6 is in liquid communication with the interface S of the degassing module 10 through a capillary connecting pipe;

a J interface of the first four-way valve 7 is communicated with a B interface of the second tee joint 14 through a capillary connecting pipe;

a K port of the first four-way valve 7 is communicated with one end of the first winding reaction tube 20 through a capillary connection tube;

an L interface of the first four-way valve 7 is connected with an R interface of the degassing module 10 through a capillary connecting pipe;

a J interface of the second four-way valve 8 is connected with an N interface of the cadmium column 9 through a capillary connecting pipe, and a K interface of the second four-way valve 8 is communicated with an O interface of the cadmium column 9 through the capillary connecting pipe;

an L interface of the second four-way valve 8 is communicated with an A interface of the fifth tee joint 17 through a capillary connecting pipe, and an M interface of the second four-way valve 8 is communicated with one end of the fourth winding reaction pipe 23 through a capillary connecting pipe;

the P interface of the degassing module 10 is blocked by a dead plug, and the Q interface of the degassing module 10 is connected to a waste liquid bottle 27 by a capillary connecting pipe;

one end of a sixth winding reaction tube 25 in the heating module 11 is communicated with the interface C of the second tee joint 14 through a capillary connecting tube, and the other end is communicated with the interface B of the first second tee joint 18 through a capillary connecting tube;

one end of a seventh winding reaction tube 26 in the ultraviolet digestion device 12 is communicated with the interface A of the first two-way pipe 18 through a capillary connecting tube, and the other end is communicated with the interface B of the first three-way pipe 13;

an interface A of the first tee joint 13 is connected with the sodium metabisulfite pump pipe 36 through a capillary connecting pipe, an interface B of the first tee joint 13 is communicated with the other end of the seventh winding reaction pipe 26 in the ultraviolet digestion device 12, and an interface C is communicated with the other end of the first winding reaction pipe 20 through a capillary connecting pipe;

the A interface of the second tee joint 14 is connected with the potassium persulfate/boric acid pump pipe 37 through a capillary connecting pipe, and the B interface of the second tee joint 14 is connected with the J interface of the first four-way valve 7 through a capillary connecting pipe;

the interface A of the third tee 15 is communicated with the other end of the second winding reaction tube 21 through a capillary connecting tube, and the interface C of the third tee 15 is connected with one end of a third winding reaction tube 22 through a capillary connecting tube;

the interface A of the fourth tee 16 is connected with the other end of the third winding reaction tube 22 through a capillary connecting tube, and the interface C of the fourth tee 16 is communicated with the other end of the fourth winding reaction tube 23 through a capillary connecting tube;

the C interface of the fifth tee joint 17 is communicated with one end of a fifth winding reaction tube 24 through a capillary connecting tube; the other end of the fifth winding reaction tube 24 is communicated with the interface A of the second two-way 19 through a capillary connecting tube;

one end of the first back pressure pipe 47 is connected with an O interface of the degassing module 10, and the other end is communicated with the waste liquid bottle 27;

one end of the second back pressure pipe 48 is connected with a D interface of the electric multi-position valve 6, and the other end is connected with the waste liquid bottle 27;

one end of a third back pressure pipe 49 is connected with the outlet of the flow cell 5, and the other end is connected with a waste liquid bottle 27;

the interface B of the second two-way 19 is connected with the inlet of the flow cell 5 through a capillary connecting pipe, and the outlet of the flow cell 5 is in liquid communication with the waste liquid bottle 27 through the capillary connecting pipe;

the flow cell 5 is placed in the detector 3, and the detector 3 is used for detecting the absorbance of the mixed solution in the flow cell;

a data processing station 4 is connected to said detector 3 to process the data it detects.

The first winding reaction tube 20, the second winding reaction tube 21, the third winding reaction tube 22, the fourth winding reaction tube 23 and the seventh winding reaction tube 26 for ultraviolet digestion have a length of 1-3m, the fifth winding reaction tube 24 and the sixth winding reaction tube 25 for heating reaction have a length of 1-5m and an inner diameter of 0.3-1.5 mm.

The first back pressure pipe 47, the second back pressure pipe 48 and the third back pressure pipe 49 have a length of 1 to 5m and an inner diameter of 0.3 to 1.0 mm.

The capillary connecting pipe has a length of 0.1-1m and an inner diameter of 0.3-1.0 mm. The sample ring 34 has a length of 1 to 5m and an inner diameter of 0.3 to 1.0 mm.

The inner diameters of a sample peristaltic pump tube 39, a current-carrying peristaltic pump tube 40, a sodium metabisulfite peristaltic pump tube 37, a potassium persulfate/boric acid peristaltic pump tube 38, a complexing agent peristaltic pump tube 41, a buffer solution peristaltic pump tube 42 and a color developing agent peristaltic pump tube 43 are 0.38-1.52mm, and the pump speed of the peristaltic pump 2 is 20-40 rpm/min.

Preferably, the optical length of the flow cell 5 is 10-50 mm.

The total nitrogen determination process comprises the following steps: the electric multi-position valve 6 is first in the loaded state. When the electric multi-position valve 6 is in a sample loading state and the first four-way valve 7 is in a state of connecting the M interface and the J interface, a sample enters the sample peristaltic pump pipe 39 and the M interface of the first four-way valve 7 through the driving of the peristaltic pump 2, at the moment, the M interface of the first four-way valve 7 is communicated with the J interface, and the sample is discharged from the J interface and enters the second three-way 14 through the B interface of the second three-way 14.

The potassium persulfate/boric acid solution is driven by the peristaltic pump 2 to enter the potassium persulfate/boric acid pump pipe 37, enters the second tee joint 14 through the A interface of the second tee joint, is mixed with a sample in the second tee joint 14 to form a first mixed solution, then the first mixed solution enters the sixth winding reaction pipe 25 in the heating device 11 through the A interface of the heating device 11 to be subjected to heating reaction, then enters the first second through 18 through the B interface of the heating device 11, the other end of the first second through 18 is connected with the B interface of the ultraviolet digestion device 12, the reacted first mixed solution enters the seventh winding reaction pipe 26 in the ultraviolet digestion device 12 through the B interface of the ultraviolet digestion device 12 to be subjected to ultraviolet digestion reaction, and then enters the B interface of the first tee joint 13 through the A interface of the ultraviolet digestion device 12 to enter the first tee joint 13.

The sodium metabisulfite solution is driven by the peristaltic pump 2, enters the sodium metabisulfite pump pipe 37, enters the first tee joint 13 through the A interface of the first tee joint, forms the second mixed solution after mixing with the first mixed solution, then flows out from the C port of the first tee joint 13, enters the first winding reaction pipe 20, the first winding reaction pipe is connected with the K port of the first four-way valve 7, the K port is communicated with the L port, then enters the degassing module through the R port of the degassing module 10, and then enters the I port of the electric multi-position valve 6 through the S port of the degassing module 10, the I port is communicated with the H port, the second mixed solution enters the sample ring 34 and fills the sample ring, the redundant second mixed solution enters the E port of the electric multi-position valve 6, the E port is communicated with the D port, and the redundant second mixed solution enters the waste liquid bottle 27 through the D port.

Then, the electric multi-position valve 6 is switched to the sample injection state. When the electric multi-position valve 6 is in a sample injection state, the current-carrying enters the current-carrying peristaltic pump tube 40 and the G interface of the electric multi-position valve 6 through the driving of the peristaltic pump 2, the G interface is communicated with the H interface at the moment, the current-carrying pushes the second mixed liquid in the sample ring 34 to enable the second mixed liquid to enter the E interface of the electric multi-position valve 6, the E interface is communicated with the F interface at the moment, and the second mixed liquid enters the second winding reaction tube 21 through the F interface. The second winding reaction tube 21 is connected with an interface A of the third tee 15, the complexing agent is driven by the peristaltic pump 2 to enter the complexing agent peristaltic pump tube 41, enters the third tee 15 through an interface B of the third tee 15 and is mixed with the second mixed solution in the third tee 15 to form a third mixed solution, then the third mixed solution enters the third winding reaction tube 22 for mixing reaction, and the third mixed solution enters an interface A of the fourth tee 16.

The buffer solution is driven by the peristaltic pump 2, enters the buffer solution peristaltic pump pipe 42, enters the fourth tee 16 through the interface B of the fourth tee 16, reacts with the third mixed solution to form a fourth mixed solution, enters the fourth winding reaction pipe 23, is subjected to a mixing reaction, and forms a fourth mixed solution, enters the second four-way valve 8 through the interface M of the second four-way valve 8.

An M interface of the second four-way valve 8 is communicated with a J interface, enters the cadmium column 9 through an N interface of the cadmium column 9, carries out reduction reaction to generate a fifth mixed solution, then enters a K interface of the second four-way valve through an O interface of the cadmium column 9, the K interface is communicated with the L, and then enters the fifth tee joint 17 through an A interface of the fifth tee joint 17.

The color developing agent is driven by the peristaltic pump 2, enters the color developing agent peristaltic pump pipe 43, enters the fifth tee joint 17 through the interface B of the fifth tee joint 17, is mixed with the fifth mixed solution in the fifth tee joint 17, and then forms a sixth mixed solution which enters the fifth winding reaction pipe 24 for mixing reaction.

The A interface of the second two-way 19 is connected with one end of the fifth winding reaction tube 24, the B interface is connected with the inlet of the flow cell 5, and the sixth mixed liquid enters the second two-way through the A interface of the second two-way 19 and then enters the flow cell 5 through the B interface. The detector 3 detects the absorbance of the solution in the flow cell 5, the data processing workstation 4 records the data, and finally the detected liquid flows into the waste liquid bottle 27.

Nitrate determination process: the electric multi-position valve 6 is first in the loaded state. When the electric multi-position valve 6 is in a sample loading state, and the first four-way valve 7 is in a state that the M interface is connected with the L interface, a sample enters the sample peristaltic pump pipe 39 and the M interface of the first four-way valve 7 through the drive of the peristaltic pump 2, at the moment, the M interface of the first four-way valve 7 is communicated with the L interface, the sample comes out from the L interface and enters the degassing module through the R interface of the degassing module 10, and then enters the I interface of the electric multi-position valve 6 through the S interface of the degassing module 10, at the moment, the I interface is communicated with the H interface, the sample enters the sample ring 34 and is filled with the sample ring, redundant sample enters the E interface of the electric multi-position valve 6, at the moment, the E interface is communicated with the D interface, and redundant sample enters the waste liquid bottle 27 through the D interface.

Then, the electric multi-position valve 6 is switched to the sample injection state. When the electric multi-position valve 6 is in a sample injection state, a carrier current enters the carrier current peristaltic pump tube 40 and the G interface of the electric multi-position valve 6 through the driving of the peristaltic pump 2, the G interface is communicated with the H interface at the moment, the carrier current pushes a sample in the sample ring 34 to enable the sample to enter the E interface of the electric multi-position valve 6, the E interface is communicated with the F interface at the moment, and the sample enters the second winding reaction tube 21 through the F interface. The second winding reaction tube 21 is connected with an interface A of the third tee 15, the complexing agent is driven by the peristaltic pump 2 to enter the complexing agent peristaltic pump tube 41, enters the third tee 15 through an interface B of the third tee 15 and is mixed with the sample in the third tee 15 to form a first mixed solution, then the first mixed solution enters the third winding reaction tube 22 for mixing reaction, and the first mixed solution enters an interface A of the fourth tee 16.

The buffer solution is driven by the peristaltic pump 2, enters the buffer solution peristaltic pump pipe 42, enters the fourth tee 16 through the interface B of the fourth tee 16, reacts with the first mixed solution to form a second mixed solution, enters the fourth winding reaction pipe 23, is subjected to a mixing reaction, and forms a second mixed solution, enters the second four-way valve 8 through the interface M of the second four-way valve 8.

An M interface of the second four-way valve 8 is communicated with a J interface, enters the cadmium column 9 through an N interface of the cadmium column 9, carries out reduction reaction to generate a third mixed solution, then enters a K interface of the second four-way valve through an O interface of the cadmium column 9, the K interface is communicated with the L, and then enters the fifth tee 17 through an A interface of the fifth tee 17.

The color developing agent is driven by the peristaltic pump 2, enters the color developing agent peristaltic pump pipe 43, enters the fifth tee joint 17 through the interface B of the fifth tee joint 17, is mixed with the third mixed solution in the fifth tee joint 17, and then forms a fourth mixed solution to enter the fifth winding reaction pipe 24 for mixing reaction.

The interface A of the second two-way 19 is connected with one end of the fifth winding reaction tube 24, the interface B is connected with the inlet of the flow cell 5, and the fourth mixed liquid enters the second two-way through the interface A of the second two-way 19 and then enters the flow cell 5 through the interface B. The detector 3 detects the absorbance of the solution in the flow cell 5, the data processing workstation 4 records the data, and finally the detected liquid flows into the waste liquid bottle 27.

The nitrite determination process comprises the following steps: the operation state of the electric multi-position valve 6 is the same as that of the nitrate measuring section, and the operation connection state of the first four-way valve 7 is also the same as that of the nitrate measuring section. The sample is driven by the peristaltic pump 2, enters the first four-way valve 7, then passes through the degassing module 10 and the electric multi-position valve 6, and enters the second winding reaction tube 21.

The second winding reaction tube 21 is connected with an interface A of the third tee 15, the complexing agent is driven by the peristaltic pump 2 to enter the complexing agent peristaltic pump tube 41, enters the third tee 15 through an interface B of the third tee 15 and is mixed with the sample in the third tee 15 to form a first mixed solution, then the first mixed solution enters the third winding reaction tube 22 for mixing reaction, and the first mixed solution enters an interface A of the fourth tee 16.

The interface M of the second four-way valve 8 is communicated with the interface L, and then enters the fifth tee joint 17 through the interface A of the fifth tee joint 17.

The color developing agent is driven by the peristaltic pump 2, enters the color developing agent peristaltic pump pipe 43, enters the fifth tee joint 17 through the interface B of the fifth tee joint 17, is mixed with the second mixed solution in the fifth tee joint 17, and then forms a third mixed solution which enters the fifth winding reaction pipe 24 for mixing reaction.

The interface A of the second two-way 19 is connected with one end of the fifth winding reaction tube 24, the interface B is connected with the inlet of the flow cell 5, and the third mixed liquid enters the second two-way through the interface A of the second two-way 19 and then enters the flow cell 5 through the interface B. The detector 3 detects the absorbance of the solution in the flow cell 5, the data processing workstation 4 records the data, and finally the detected liquid flows into the waste liquid bottle 27.

The utility model has the following beneficial effects: the sample can be continuously and automatically tested, the testing speed is high, the sample testing frequency is 35-90 samples/hour, and the detection efficiency of total nitrogen, nitrate and nitrite in water is improved; the test sensitivity is high, and the linear range is 10 mu g N/L-2000 mu g N/L; the detection limit can be as low as 2.0 mu g N/L (total nitrogen), 0.2 mu g/L (nitrate) and 0.1 mu g/L (nitrite); the method has the advantages of good accuracy, high precision and good repeatability, and completely meets the requirements of national standards such as underground water quality standard GB/T14848-93, sanitary standards for drinking water (GB5749-2006), surface water environmental quality standard (GB 3838-.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An automatic analyzer for multiple parameters of different nitrogen forms in water is characterized by comprising an automatic sample injector, a solution conveying part, a chemical reaction part and a detector, the automatic sample injector is connected with the solution conveying part through a pipeline, the solution conveying part is connected with the chemical reaction part through a pipeline, the automatic sample injector is used for absorbing liquid to be detected, the solution conveying part is used for conveying the liquid to be detected, current carrying, potassium metabisulfite, potassium persulfate/boric acid, complexing agent, buffer solution and color developing agent to the chemical reaction part respectively, the chemical reaction part is used for mixing liquid to be detected, current-carrying, potassium metabisulfite, potassium persulfate/boric acid, a complexing agent, a buffer solution and a color developing agent in sequence to obtain a mixed solution, and inputting the mixed solution into a detector, wherein the detector is used for detecting the absorbance of the mixed solution.

2. The multi-parameter autoanalyzer according to claim 1, wherein the automatic sample injector comprises a sample tray for holding test tubes and a first motor for driving the sample tray to rotate, an output shaft of the first motor is connected to a rotation shaft of the sample tray, the sample tray is provided with a plurality of circular holes for holding test tubes, the test tubes for holding samples and standard solutions are inserted into the circular holes, the automatic sample injector further comprises a sample injection needle capable of being inserted into the test tubes and a second motor for driving the sample injection needle to move up and down, an output end of the second motor is connected to the sample injection needle, the second motor and the sample injection needle are mounted on a sample injection arm, the sample injection arm is connected to an output shaft of a third motor for driving the sample injection arm to swing above the sample tray, so that the sample injection needle can enter the selected test tube, and the outer end of the sample injection needle is connected with the solution conveying part through a pipeline.

3. The multi-parameter automatic analyzer for different nitrogen forms in water according to claim 2, wherein the solution conveying part comprises a peristaltic pump, and the peristaltic pump is used for conveying liquid in a sample peristaltic pump tube, a current-carrying peristaltic pump tube, a potassium metabisulfite peristaltic pump tube, a potassium persulfate/boric acid peristaltic pump tube, a complexing agent peristaltic pump tube, a buffer solution peristaltic pump tube and a color developing agent peristaltic pump tube;

4. The multiparameter analyzer for different nitrogen forms in water of claim 3, further comprising a data processing station connected to said detector for processing the data detected thereby.

5. The multi-parameter automatic analyzer for different nitrogen forms in water according to claim 4, wherein the first winding reaction tube, the second winding reaction tube, the third winding reaction tube, the fourth winding reaction tube and the seventh winding reaction tube for ultraviolet digestion have a length of 1-3m, the fifth winding reaction tube and the sixth winding reaction tube for heating reaction have a length of 1-5m, and an inner diameter of 0.3-1.5 mm.

6. The multiparameter automatic analyzer for different nitrogen forms in water of claim 5, wherein the first back pressure pipe, the second back pressure pipe and the third back pressure pipe have a length of 1-5m and an inner diameter of 0.3-1.0 mm.

7. The multiparameter automatic analyzer for different nitrogen forms in water according to claim 6, wherein the capillary connecting tube has a length of 0.1 to 1m and an inner diameter of 0.3 to 1.0mm, and the sample ring has a length of 1 to 5m and an inner diameter of 0.3 to 1.0 mm.

8. The multiparameter automatic analyzer for different nitrogen forms in water according to claim 7, wherein the inside diameters of the sample peristaltic pump tube, the current-carrying peristaltic pump tube, the sodium metabisulfite peristaltic pump tube, the potassium persulfate/boric acid peristaltic pump tube, the complexing agent peristaltic pump tube, the buffer solution peristaltic pump tube and the color developing agent peristaltic pump tube are 0.38-1.52 mm.