CN106289912B - Pretreatment device for online monitoring of water - Google Patents
Pretreatment device for online monitoring of water Download PDFInfo
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- CN106289912B CN106289912B CN201610808834.4A CN201610808834A CN106289912B CN 106289912 B CN106289912 B CN 106289912B CN 201610808834 A CN201610808834 A CN 201610808834A CN 106289912 B CN106289912 B CN 106289912B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/00584—Control arrangements for automatic analysers
- G01N35/0092—Scheduling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention discloses a pretreatment device for water on-line monitoring, which comprises a six-way valve (1), a peristaltic pump (2), an enrichment system (3) and a digestion system (4) which are sequentially communicated, and further comprises a control system (5), wherein the control system (5) is connected with the six-way valve (1), the peristaltic pump (2), the enrichment system (3) and the digestion system (4); the invention has simple structure, strong practicability and strong adaptability to environmental water samples, can automatically adjust according to the water quality condition, realizes flexible switching of two modes of enrichment and digestion or digestion and enrichment, realizes continuous digestion and enrichment digestion processes of samples, ensures the stability and reliability of detection equipment, prolongs the service life of instrument consumables, can be used as a pretreatment module of an on-line monitoring instrument to realize continuous on-line monitoring of the water samples, reduces the cost, reduces the use amount of chemical reagents and reduces the risk of environmental pollution.
Description
Technical field:
the invention relates to the technical field of environmental protection, in particular to a pretreatment device for water on-line monitoring.
The background technology is as follows:
in the pretreatment process of online monitoring of the current environmental water sample, the enrichment and digestion process is usually fixed in mode: in water with low organic matter content and uncomplicated water body components, a method of enriching before digesting is generally adopted, and the method has the advantages of less required chemical reagents, less sample digestion amount and the like; in the water body with high organic matter content and complex components, a method of digestion before enrichment is adopted, compared with the method, the method has the advantages that the sample amount required to be digested is large, the acid dosage is large, an additional pH adjusting reagent is required, and the risk of environmental pollution exists. Both of these methods have stability to monitor for a single stable quality water source, whereas for some uncertainty water sources, the monitoring process is susceptible to changes in water quality properties. For example, under burst conditions, the organic matter content of the water body is rapidly increased, and under the mode of enrichment and digestion, the enrichment column is extremely easy to reach adsorption saturation, so that the enrichment efficiency and stability of the enrichment column are reduced. The enrichment column is extremely easy to damage under the working condition that the water quality property is frequently and sharply changed. In the mode of enrichment after digestion, if the organic matter content of the water body is sharply reduced, a large amount of unnecessary acid is needed in the digestion process by the method, and additional reagents are needed in the pH adjustment process, so that the reagent dosage is increased, the risk of environmental pollution is increased, and the economical efficiency of the operation of the instrument is greatly reduced.
The invention comprises the following steps:
the invention aims to provide a pretreatment device for water online monitoring, which has the advantages of simple structure, strong practicability and strong adaptability to environmental water samples, can be automatically adjusted according to water quality conditions, realizes flexible switching of two modes of enrichment and digestion or digestion and enrichment and digestion by program control, realizes continuous digestion and enrichment and digestion processes of samples, ensures the stability and reliability of detection equipment, prolongs the service life of instrument consumables, can be used as a pretreatment module of an online monitoring instrument to realize continuous online monitoring of the water samples, reduces cost, reduces the use amount of chemical reagents and reduces the risk of environmental pollution.
The invention is realized by the following technical scheme:
the pretreatment device for water on-line monitoring comprises a valve switching system, a peristaltic pump, an enrichment system and a digestion system which are sequentially communicated, and further comprises a control system; the control system is connected with the valve switching system, the peristaltic pump, the enrichment system and the digestion system; the valve switching system is a six-way valve, six interfaces of the six-way valve are respectively communicated with a water sample liquid inlet pipe, a first eluent liquid inlet pipe, a digestion acid liquid inlet pipe, a first waste liquid collecting pipe, a liquid sample collecting pipe and a pH adjusting liquid inlet pipe, the common end of the six-way valve is communicated with the peristaltic pump, and the control end of the six-way valve is connected with the control system; the front end of the peristaltic pump is communicated with the public end of the six-way valve, the rear end of the peristaltic pump is communicated with the enrichment system, and the control end of the peristaltic pump is connected with the control system; the enrichment system comprises an enrichment column, an electromagnetic valve and a pipeline, wherein the electromagnetic valve and the pipeline are sequentially communicated with the enrichment column, and the control end of the electromagnetic valve of the enrichment system is connected with the control system; the electromagnetic valve is a three-way electromagnetic valve; the upper end of the enrichment column is communicated with a second electromagnetic valve, the lower end of the enrichment column is communicated with a fourth electromagnetic valve, the second electromagnetic valve is also communicated with the fourth electromagnetic valve sequentially through a first electromagnetic valve and a third electromagnetic valve, and the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the enrichment column and the second electromagnetic valve form a loop; the second electromagnetic valve is also communicated with the digestion system, the first electromagnetic valve is also communicated with the rear end of the peristaltic pump, the liquid inlet end of the enrichment system is communicated with the liquid inlet pipe of the second eluent through the third electromagnetic valve, and the liquid outlet end of the enrichment system is communicated with the second waste liquid collecting pipe through the fourth electromagnetic valve; the liquid inlet at the lower end of the digestion system is communicated with a second electromagnetic valve of the enrichment system, the upper end of the digestion system is provided with a pressure limiting valve, an air valve and a cleaning valve, a temperature control device is further arranged, and the control ends of the temperature control device, the pressure limiting valve, the air valve and the cleaning valve are connected with the control system.
The control system adopts singlechip automatic control, preferably, various data communication and data processing modules are added on the basis, and automatic acquisition, analysis and intelligent control of data are realized.
Preferably, the digestion system is a tank digestion device.
The six-way valve realizes liquid inlet and outflow of various liquids; peristaltic pumps provide motive force for liquid flow; the enrichment system realizes water sample adsorption and desorption of (a); the digestion system is used for realizing digestion of the water sample; the control system controls the six-way valve to switch through a program, the rotating speed and the direction of the peristaltic pump, the communication state of a three-way electromagnetic valve in the enrichment system, the switching states of a temperature control device, a pressure limiting valve, an air valve and a cleaning valve in the digestion system, and the switching of the two modes of the enrichment mode before digestion and the enrichment mode after digestion and the liquid working condition selection are realized.
The invention also protects the use method of the device, under the mode of enrichment before digestion, the control system controls the six-way valve to be switched to the water sample liquid inlet pipe, the peristaltic pump to rotate forward, the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve in the enrichment system to be switched, the water sample enters the six-way valve through the water sample liquid inlet pipe, then enters the enrichment system through the peristaltic pump through the pipeline, enters the enrichment column through the first electromagnetic valve and the second electromagnetic valve to be adsorbed, and enters the second waste liquid collecting pipe through the fourth electromagnetic valve in the enrichment system to complete the sample adsorption process after the adsorption is completed. In the elution process, the control system controls the six-way valve to switch, the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the second electromagnetic valve in the enrichment system to switch, the air valve in the digestion system is opened, and eluent enters the six-way valve through the first eluent inlet pipe and then enters the enrichment system through the peristaltic pump through the connecting pipeline. In the enrichment system, the eluent sequentially passes through the first electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve and the enrichment column, and then enters the digestion system through the second electromagnetic valve. After a certain amount of eluent passes through the enrichment column, the control system controls the six-way valve to switch, and the first electromagnetic valve and the second electromagnetic valve in the enrichment system to switch. The digestion acid used by the digestion system enters the six-way valve through the digestion acid liquid inlet pipe, then passes through the peristaltic pump and enters the digestion system through the first electromagnetic valve and the second electromagnetic valve in the enrichment system. In the liquid digestion process, an air valve and a cleaning valve of a digestion system are closed, and digestion temperature and time are controlled by a temperature control device. After digestion is completed, the control system controls the air valve to be opened, the peristaltic pump to be reversed, the six-way valve to be switched, liquid enters the six-way valve through a second electromagnetic valve and the peristaltic pump in the enrichment system, and flows out of the liquid sample collecting pipe of the six-way valve to be tested.
Under the enrichment mode after digestion, the control system controls the six-way valve, the peristaltic pump and the first electromagnetic valve and the second electromagnetic valve in the enrichment system to switch and the air valve in the digestion system to be opened, a water sample enters the six-way valve through the water sample liquid inlet pipe, then directly enters the digestion system through the peristaltic pump and the first electromagnetic valve and the second electromagnetic valve in the enrichment system, after the water sample enters a certain volume, the control system controls the six-way valve to switch, and digestion acid used by the digestion system enters the six-way valve from the digestion acid liquid inlet pipe of the six-way valve in the same way, and then directly enters the digestion system through the peristaltic pump and the first electromagnetic valve and the second electromagnetic valve in the enrichment system; in the liquid digestion process, an air valve and a cleaning valve of a digestion system are closed, and digestion temperature and time are controlled by a temperature control device. After digestion is completed, the control system controls the air valve to be opened, and pH adjusting liquid enters the six-way valve through a pH adjusting liquid inlet pipe of the six-way valve and then enters the digestion system through a peristaltic pump and a first electromagnetic valve and a second electromagnetic valve in the enrichment system. After the pH adjustment of the digestion sample is completed, the control system controls the air valve to be opened, the second electromagnetic valve, the fourth electromagnetic valve, the third electromagnetic valve and the first electromagnetic valve in the enrichment system to be switched, the peristaltic pump to be reversed, the six-way valve to be switched, liquid flows out of the digestion system, enters the enrichment column through the second electromagnetic valve in the enrichment system to be adsorbed, enters the six-way valve through the fourth electromagnetic valve, the third electromagnetic valve and the peristaltic pump after the adsorption is completed, and flows out of the first waste liquid collecting pipe. In the elution process, the control system controls the switching of a third electromagnetic valve, a fourth electromagnetic valve, a second electromagnetic valve and a first electromagnetic valve in the enrichment system, eluent enters the enrichment column from a second eluent inlet pipe in the enrichment system through the third electromagnetic valve and the fourth electromagnetic valve in sequence, then enters the six-way valve through the second electromagnetic valve, the first electromagnetic valve and the peristaltic pump in sequence, flows out from a liquid sample collecting pipe, and elution after digestion and enrichment is completed.
In a pipeline cleaning mode, the control system controls the air valve in the digestion system to be closed, the cleaning valve to be opened and the peristaltic pump to rotate reversely, cleaning liquid flows through the digestion system to digest the pipeline through the cleaning valve, and then enters the six-way valve through the peristaltic pump through the second electromagnetic valve, the enrichment column, the fourth electromagnetic valve, the third electromagnetic valve and the first electromagnetic valve in the enrichment system, and the cleaning liquid flows out of the first waste liquid collecting pipe of the six-way valve to complete the pipeline cleaning process. When the cleaning liquid enters a certain amount, the control system controls the cleaning valve to be closed, the air valve to be opened, and after the cleaning liquid flows out of the whole pipeline, the cleaning valve is opened again, the air valve is closed, and the second cleaning is started.
The beneficial effects of the invention are as follows:
1. the invention has strong adaptability to environmental water samples, is suitable for the pretreatment process of online monitoring of water quality with stable properties and single components, can adapt to the conditions of severe water quality change, complex water quality components and changeability, can greatly improve the stability and reliability of a pretreatment device by program setting and software control, and prolongs the service life of instrument consumables.
2. The system has simple structure, the pipeline system can realize the flow direction and flow speed control of the fluid only by a single peristaltic pump, and the system is simple to realize and low in cost.
3. The invention realizes flexible switching of two modes of enrichment and digestion or digestion and enrichment by program control, not only can adapt to various different water qualities, but also can reduce the use amount of chemical reagents and reduce the risk of environmental pollution. The cost is also effectively reduced for equipment which operates for a long time.
4. The invention can also realize the cleaning of the pipeline.
In a word, the invention has simple structure, strong practicability and strong adaptability to environmental water samples, can be automatically regulated according to water quality conditions, realizes flexible switching of two modes of enrichment and digestion or digestion and enrichment, realizes continuous digestion and enrichment digestion processes of samples, ensures the stability and reliability of detection equipment, prolongs the service life of instrument consumables, can be used as a pretreatment module of an on-line monitoring instrument to realize continuous on-line monitoring of the water samples, reduces the cost, reduces the use amount of chemical reagents and reduces the risk of environmental pollution.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
the device comprises a six-way valve, 2, a peristaltic pump, 3, an enrichment system, 4, a digestion system, 5, a control system, 11, a water sample liquid inlet pipe, 12, a first eluent liquid inlet pipe, 13, a digestion acid liquid inlet pipe, 14, a liquid sample collecting pipe, 15, a pH adjusting liquid inlet pipe, 16, a first waste liquid collecting pipe, 30, an enrichment column, 31, a first electromagnetic valve, 32, a second electromagnetic valve, 33, a third electromagnetic valve, 34, a fourth electromagnetic valve, 35, a second eluent liquid inlet pipe 36, a second waste liquid collecting pipe, 40, a temperature control device, 41, a pressure limiting valve, 42, an air valve, 43 and a cleaning valve.
The specific embodiment is as follows:
the following is a further illustration of the invention and is not a limitation of the invention.
Example 1:
the pretreatment device for water on-line monitoring has the structure shown in fig. 1, and comprises a six-way valve 1, a peristaltic pump 2, an enrichment system 3 and a digestion system 4 which are sequentially communicated, and further comprises a control system 5; the control system 5 is connected with the six-way valve 1, the peristaltic pump 2, the enrichment system 3 and the digestion system 4; six interfaces of the six-way valve 1 are respectively communicated with a water sample liquid inlet pipe 11, a first eluent liquid inlet pipe 12, a digestion acid liquid inlet pipe 13, a first waste liquid collecting pipe 16, a liquid sample collecting pipe 14 and a pH adjusting liquid inlet pipe 15, the public end of the six-way valve 1 is communicated with the peristaltic pump 2, and the control end of the six-way valve 1 is connected with the control system 5; the front end of the peristaltic pump 2 is communicated with the public end of the six-way valve 1, the rear end of the peristaltic pump 2 is communicated with the enrichment system 3, and the control end of the peristaltic pump 2 is connected with the control system 5; the enrichment system 3 comprises an enrichment column 30, electromagnetic valves 31-34 and a pipeline, wherein the electromagnetic valves 31-34 are sequentially communicated with the enrichment column 30, and the control end of the electromagnetic valve of the enrichment system 3 is connected with the control system 5; the electromagnetic valves 31-34 are three-way electromagnetic valves; the upper end of the enrichment column 30 is communicated with a second electromagnetic valve 32, the lower end of the enrichment column 30 is communicated with a fourth electromagnetic valve 34, the second electromagnetic valve 32 is also communicated with the fourth electromagnetic valve 34 sequentially through a first electromagnetic valve 31 and a third electromagnetic valve 33, and the first electromagnetic valve 31, the third electromagnetic valve 33, the fourth electromagnetic valve 34, the enrichment column 30 and the second electromagnetic valve 32 form a loop; the second electromagnetic valve 32 is also communicated with the digestion system 4, the first electromagnetic valve 31 is also communicated with the rear end of the peristaltic pump 2, the liquid inlet end of the enrichment system 3 is also communicated with the second eluent inlet pipe 35 through the third electromagnetic valve 33, and the liquid outlet end of the enrichment system 3 is also communicated with the second waste liquid collecting pipe 36 through the fourth electromagnetic valve 34; the digestion system 4 is a tank digestion device, a liquid inlet at the lower end of the tank digestion device is communicated with the second electromagnetic valve 32 of the enrichment system 3, a pressure limiting valve 41, an air valve 42 and a cleaning valve 43 are arranged at the upper end of the tank digestion device, a temperature control device 40 is further arranged on the tank digestion device, and control ends of the temperature control device 40, the pressure limiting valve 41, the air valve 42 and the cleaning valve 43 are connected with the control system 5. The control end of the six-way valve 1, the control end of the peristaltic pump 2, the control end of the electromagnetic valve of the enrichment system 3, the control end of the temperature control device 40, the pressure limiting valve 41, the air valve 42 and the cleaning valve 43 in the digestion system 4 are all connected with the control system 5.
Under the mode of enrichment and digestion, the control system 5 controls the six-way valve 1 to be switched to the water sample liquid inlet pipe 11, the peristaltic pump 2 to rotate forwards, the first electromagnetic valve 31, the second electromagnetic valve 32 and the fourth electromagnetic valve 34 in the enrichment system 3 to be switched, a water sample enters the six-way valve 1 through the water sample liquid inlet pipe 11, then enters the enrichment system 3 through the peristaltic pump 2 through a pipeline, enters the enrichment column 30 through the first electromagnetic valve 31 and the second electromagnetic valve 32 to be adsorbed, and enters the second waste liquid collecting pipe 36 through the fourth electromagnetic valve 34 in the enrichment system 3 to complete the sample adsorption process after the adsorption is completed. In the elution process, the control system 5 controls the six-way valve 1 to switch, the first electromagnetic valve 31, the third electromagnetic valve 33, the fourth electromagnetic valve 34 and the second electromagnetic valve 32 in the enrichment system 3 to switch, the air valve 42 in the digestion system 4 to open, and the eluent enters the six-way valve 1 through the first eluent inlet pipe 12 and then enters the enrichment system 3 through the peristaltic pump 2 through the connecting pipeline. In the enrichment system 3, the eluent passes through the first solenoid valve 31, the third solenoid valve 33, the fourth solenoid valve 34 and the enrichment column 30 in sequence, and then passes through the second solenoid valve 32 to enter the digestion system 4. After a certain amount of eluent passes through the enrichment column 30, the control system 5 controls the six-way valve 1 to switch, the first electromagnetic valve 31 and the second electromagnetic valve 32 in the enrichment system 3 to switch, and digestion acid for the digestion system enters the six-way valve 1 through the digestion acid liquid inlet pipe 13 and then enters the digestion system 4 through the peristaltic pump 2 and the first electromagnetic valve 31 and the second electromagnetic valve 32 in the enrichment system 3. During liquid digestion, the air valve 42 and the cleaning valve 43 of the digestion system 3 are closed, and the digestion temperature and time are controlled by the temperature control device 40. After digestion is completed, the control system 5 controls the air valve 42 to be opened, the peristaltic pump 2 to be reversed, the six-way valve 1 to be switched, and liquid enters the six-way valve 1 through the second electromagnetic valve 32, the first electromagnetic valve 31 and the peristaltic pump 2 in the enrichment system 3, and flows out of the liquid sample collecting pipe 14 of the six-way valve 1 to be tested.
In the enrichment mode after digestion, the control system 5 controls the six-way valve 1, the peristaltic pump 2, the first electromagnetic valve 31 and the second electromagnetic valve 32 in the enrichment system 3 to be switched, and the air valve 42 in the digestion system 4 to be opened, a water sample enters the six-way valve 1 through the water sample liquid inlet pipe 11, then directly enters the digestion system 4 through the peristaltic pump 2, the first electromagnetic valve 31 and the second electromagnetic valve 32 in the enrichment system 3, after the water sample enters a certain volume, the control system 5 controls the six-way valve 1 to be switched, and digestion acid for the digestion system enters the six-way valve 1 from the digestion acid liquid inlet pipe 13 of the six-way valve 1, and then directly enters the digestion system 4 through the peristaltic pump 2, the first electromagnetic valve 31 and the second electromagnetic valve 32 in the enrichment system 3; during liquid digestion, the air valve 42 and the purge valve 43 of the digestion system 4 are closed, and the digestion temperature and time are controlled by the temperature control device 40. After digestion is completed, the control system 5 controls the air valve 42 to be opened, and the pH adjusting liquid enters the six-way valve 1 through the pH adjusting liquid inlet pipe 15 of the six-way valve 1 and then enters the digestion system 4 through the peristaltic pump 2, the first electromagnetic valve 31 and the second electromagnetic valve 32 in the enrichment system 3. After the digestion sample pH adjustment is completed, the control system 5 controls the air valve 42 to be opened, the second electromagnetic valve 32, the fourth electromagnetic valve 34, the third electromagnetic valve 33 and the first electromagnetic valve 31 in the enrichment system 3 to be switched, the peristaltic pump 2 to be reversed, the six-way valve 1 to be switched, liquid flows out of the digestion system 4, enters the enrichment column 30 through the second electromagnetic valve 32 in the enrichment system 3 to be adsorbed, and enters the six-way valve 1 through the fourth electromagnetic valve 34, the third electromagnetic valve 33, the first electromagnetic valve 31 and the peristaltic pump 2 to flow out of the first waste liquid collecting pipe 16 after the adsorption is completed. In the elution process, the control system 5 controls the third electromagnetic valve 33, the fourth electromagnetic valve 34, the second electromagnetic valve 32 and the first electromagnetic valve 31 in the enrichment system 3 to switch, and the eluent sequentially enters the enrichment column 30 from the second eluent inlet pipe 35 in the enrichment system 3 through the third electromagnetic valve 33 and the fourth electromagnetic valve 34, sequentially enters the six-way valve 1 through the second electromagnetic valve 32, the first electromagnetic valve 31 and the peristaltic pump 2, flows out from the liquid sample collecting pipe 14, and completes elution after digestion enrichment.
In the pipeline cleaning mode, the control system 5 controls the air valve 42 in the digestion system 4 to be closed, the cleaning valve 43 to be opened, the peristaltic pump 2 to reverse, cleaning liquid flows through the digestion system 4 to digest the pipeline through the cleaning valve 43, then the cleaning liquid enters the six-way valve 1 through the peristaltic pump 2 through the second electromagnetic valve 32, the enrichment column 30, the fourth electromagnetic valve 34, the third electromagnetic valve 33 and the first electromagnetic valve 31 in the enrichment system 3, and the cleaning liquid flows out of the first waste liquid collecting pipe 16 of the six-way valve 1 to complete the pipeline cleaning process. After a certain amount of cleaning liquid enters, the control system 5 controls the cleaning valve 43 to be closed, the air valve 42 to be opened, and after the cleaning liquid flows out of the whole pipeline, the cleaning valve 43 is opened again, the air valve 42 is closed, and the second cleaning is started.
Claims (5)
1. The pretreatment device for online monitoring of water is characterized by comprising a six-way valve (1), a peristaltic pump (2), an enrichment system (3) and a digestion system (4) which are sequentially communicated, and further comprising a control system (5); the control system (5) is connected with the six-way valve (1), the peristaltic pump (2), the enrichment system (3) and the digestion system (4); six interfaces of the six-way valve (1) are respectively communicated with a water sample liquid inlet pipe (11), a first eluent liquid inlet pipe (12), a digestion acid liquid inlet pipe (13), a first waste liquid collecting pipe (16), a liquid sample collecting pipe (14) and a pH adjusting liquid inlet pipe (15), the public end of the six-way valve (1) is communicated with the peristaltic pump (2), and the control end of the six-way valve (1) is connected with the control system (5); the front end of the peristaltic pump (2) is communicated with the public end of the six-way valve (1), the rear end of the peristaltic pump (2) is communicated with the enrichment system (3), and the control end of the peristaltic pump (2) is connected with the control system (5); the enrichment system (3) comprises an enrichment column (30), a first electromagnetic valve (31), a second electromagnetic valve (32), a third electromagnetic valve (33), a fourth electromagnetic valve (34) and a pipeline, and the electromagnetic valve control end of the enrichment system (3) is connected with the control system (5); the first electromagnetic valve (31), the second electromagnetic valve (32), the third electromagnetic valve (33) and the fourth electromagnetic valve (34) are three-way electromagnetic valves; the upper end of the enrichment column (30) is communicated with a second electromagnetic valve (32), the lower end of the enrichment column (30) is communicated with a fourth electromagnetic valve (34), the second electromagnetic valve (32) is also communicated with the fourth electromagnetic valve (34) sequentially through a first electromagnetic valve (31) and a third electromagnetic valve (33), and the first electromagnetic valve (31), the third electromagnetic valve (33), the fourth electromagnetic valve (34), the enrichment column (30) and the second electromagnetic valve (32) form a loop; the second electromagnetic valve (32) is also communicated with the digestion system (4), the first electromagnetic valve (31) is also communicated with the rear end of the peristaltic pump (2), the third electromagnetic valve (33) is also communicated with the second eluent inlet pipe (35), and the fourth electromagnetic valve (34) is also communicated with the second waste liquid collecting pipe (36); the liquid inlet at the lower end of the digestion system (4) is communicated with a second electromagnetic valve (32) of the enrichment system (3), a pressure limiting valve (41), an air valve (42) and a cleaning valve (43) are arranged at the upper end of the digestion system, a temperature control device (40) is further arranged, and the control ends of the temperature control device (40), the pressure limiting valve (41), the air valve (42) and the cleaning valve (43) are connected with the control system (5).
2. Pretreatment device for on-line monitoring of water according to claim 1, characterized in that the digestion system (4) is a tank digestion device.
3. A method of using the pretreatment device for on-line monitoring of water as claimed in claim 1 or 2, characterized in that in the pre-enrichment and digestion mode, the control system (5) controls the six-way valve (1) to switch to the water sample inlet pipe (11), the peristaltic pump (2) to rotate forward, the first electromagnetic valve (31), the second electromagnetic valve (32) and the fourth electromagnetic valve (34) in the enrichment system (3) to switch, the water sample enters the six-way valve (1) through the water sample inlet pipe (11), then enters the enrichment system (3) through the peristaltic pump (2) through the pipeline, enters the enrichment column (30) through the first electromagnetic valve (31) and the second electromagnetic valve (32) to perform adsorption, after adsorption is completed, enters the second waste liquid collecting pipe (36) through the fourth electromagnetic valve (34) in the enrichment system (3) to complete the sample adsorption process, enters the elution process, the control system (5) controls the six-way valve (1) to switch, the first electromagnetic valve (31), the third electromagnetic valve (33), the fourth electromagnetic valve (34) and the second electromagnetic valve (32) to switch, the digestion system (4) to enter the eluent into the enrichment system (3) through the peristaltic pump (12) through the first electromagnetic valve (3) after adsorption system (3), eluent sequentially passes through a first electromagnetic valve (31), a third electromagnetic valve (33), a fourth electromagnetic valve (34) and an enrichment column (30), then enters a digestion system (4) through a second electromagnetic valve (32), after a certain amount of eluent passes through the enrichment column (30), a control system (5) controls a six-way valve (1) to be switched, the first electromagnetic valve (31) and the second electromagnetic valve (32) in the enrichment system (3) to be switched, digestion acid for the digestion system enters the six-way valve (1) through a digestion acid liquid inlet pipe (13), and then enters the digestion system (4) through a peristaltic pump (2) through the first electromagnetic valve (31) and the second electromagnetic valve (32) in the enrichment system (3); in the liquid digestion process, an air valve (42) and a cleaning valve (43) of a digestion system (3) are closed, digestion temperature and time are controlled by a temperature control device (40), after digestion is completed, the control system (5) controls the air valve (42) to be opened, a peristaltic pump (2) is reversed, a six-way valve (1) is switched, liquid enters the six-way valve (1) through a second electromagnetic valve (32), a first electromagnetic valve (31) and the peristaltic pump (2) in an enrichment system (3), and flows out of a liquid sample collecting pipe (14) of the six-way valve (1) to be tested.
4. The use method of the pretreatment device for water online monitoring as claimed in claim 1 or 2, wherein in a pre-digestion and post-enrichment mode, a control system (5) controls a six-way valve (1), a peristaltic pump (2) and a first electromagnetic valve (31) and a second electromagnetic valve (32) in an enrichment system (3) to be switched, an air valve (42) in a digestion system (4) is opened, a water sample enters the six-way valve (1) through a water sample liquid inlet pipe (11), then enters the digestion system (4) through the peristaltic pump (2) and the first electromagnetic valve (31) and the second electromagnetic valve (32) in the enrichment system (3), after the water sample enters a certain volume, the control system (5) controls the six-way valve (1) to be switched, and digestion acid for the digestion system enters the six-way valve (1) from a digestion acid liquid inlet pipe (13) of the six-way valve (1) and then enters the digestion system (4) through the peristaltic pump (2) and the first electromagnetic valve (31) and the second electromagnetic valve (32) in the enrichment system (3); in the liquid digestion process, an air valve (42) and a cleaning valve (43) of a digestion system (4) are closed, digestion temperature and time are controlled by a temperature control device (40), after digestion is completed, the control system (5) controls the air valve (42) to be opened, pH regulating liquid enters the six-way valve (1) through a pH regulating liquid inlet pipe (15) of the six-way valve (1), then enters the digestion system (4) through a peristaltic pump (2) and a first electromagnetic valve (31) and a second electromagnetic valve (32) in an enrichment system (3), after digestion sample pH regulation is completed, the control system (5) controls the air valve (42) to be opened, the second electromagnetic valve (32), a fourth electromagnetic valve (34), a third electromagnetic valve (33) and the first electromagnetic valve (31) in the enrichment system (3) to be switched, the peristaltic pump (2) is reversed, liquid flows out of the digestion system (4) and enters a enrichment column (30) through a second electromagnetic valve (32) in the enrichment system (3) to be adsorbed, and then flows out of the collection pipe (16) through the fourth electromagnetic valve (34), the third electromagnetic valve (33) and the first electromagnetic valve (31) to enter the peristaltic pump (16) after adsorption is completed; in the elution process, the control system (5) controls the third electromagnetic valve (33), the fourth electromagnetic valve (34), the second electromagnetic valve (32) and the first electromagnetic valve (31) in the enrichment system (3) to be switched, eluent enters the enrichment column (30) from the second eluent inlet pipe (35) in the enrichment system (3) sequentially through the third electromagnetic valve (33) and the fourth electromagnetic valve (34), then enters the six-way valve (1) sequentially through the second electromagnetic valve (32), the first electromagnetic valve (31) and the peristaltic pump (2), flows out from the liquid sample collecting pipe (14), and elution after digestion and enrichment is completed.
5. A method of using a pretreatment device for on-line monitoring of water as claimed in claim 1 or 2, characterized in that in a pipeline cleaning mode, the control system (5) controls the air valve (42) in the digestion system (4) to be closed, the cleaning valve (43) to be opened, the peristaltic pump (2) to be reversed, the cleaning solution flows through the digestion system (4) to digest the pipeline through the cleaning valve (43), and then the second electromagnetic valve (32), the enrichment column (30), the fourth electromagnetic valve (34), the third electromagnetic valve (33) and the first electromagnetic valve (31) in the enrichment system (3) enter the six-way valve (1) through the peristaltic pump (2), and the cleaning process of the pipeline is completed by flowing out of the first waste liquid collecting pipe (16) of the six-way valve (1).
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| CN108801939A (en) * | 2018-06-20 | 2018-11-13 | 广东省测试分析研究所（中国广州分析测试中心） | Various heavy on-line monitoring system and its monitoring method simultaneously in a kind of water |
| CN110470650B (en) * | 2019-08-01 | 2022-04-22 | 广东省测试分析研究所（中国广州分析测试中心） | Multi-mode quality of water heavy metal on-line monitoring system |
| CN110441291A (en) * | 2019-08-26 | 2019-11-12 | 广州伊创科技股份有限公司 | A kind of plasma atomic emission spectroscopy analyzer |
| CN112881111A (en) * | 2020-12-31 | 2021-06-01 | 中绿环保科技股份有限公司 | Quantitative premixed hydride generator |
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