CN108572205B - Preparation method of nitrite detection electrode and chemical oxygen demand detection electrode and rapid detection device - Google Patents
Preparation method of nitrite detection electrode and chemical oxygen demand detection electrode and rapid detection device Download PDFInfo
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Abstract
The invention belongs to the field of detection equipment and discloses a preparation method and a rapid detection device of a nitrite detection electrode and a chemical oxygen consumption detection electrode, wherein the nitrite detection electrode, the chemical oxygen consumption detection electrode, a reference electrode, a counter electrode, a light source and a stirring paddle are arranged in a sample cell; the light source is connected with the direct current power supply in series, the stirring paddle is driven by the micro motor to run, and the micro motor is connected with the direct current power supply in series; the electrochemical workstation is connected with a USB driving module in the portable computer, and the portable computer further comprises a nitrite analysis module, a chemical oxygen consumption analysis module and a warning system. The device has the advantages of quick detection result and high detection precision, can detect the nitrite detection content and the chemical oxygen consumption of one sample, and can be widely applied to quick field detection in the fields of food and environment.
Description
Technical Field
The invention relates to the technical field of detection equipment, in particular to a preparation method and a rapid detection device of a nitrite detection electrode and a chemical oxygen consumption detection electrode.
Background
Nitrite is widely present in natural environments and foods, while nitrous acid in foods is mainly present in coloring agents and additives, cured meat products, kimchi and deteriorated vegetables. The long-term consumption of nitrite in large amount not only has adverse effect on human health, but also can cause various diseases, such as infant distortion, purple infants, growth defects and the like. This is mainly because nitrite is a highly toxic substance because it oxidizes the normally oxygen-carrying methemoglobin in blood to methemoglobin, which loses its oxygen-carrying capacity and causes hypoxia. In addition, nitrite is a carcinogen, and according to research, the probability of esophagus cancer is in positive correlation with the amount of nitrite taken by a patient, and nitrite reacts with secondary amine, tertiary amine, amide and the like in food under the environment of gastric acid and the like to generate nitrosamine which is a strong carcinogen. Thus, day 27 of 2017, 10 months, the world health organization international agency for research on cancer promulgated on carcinogen lists, nitrite ingested under conditions leading to endogenous nitrosation was in the class 2A carcinogen list. At present, chemical analysis methods and wind photometry methods are used for detecting nitrite, but the methods have insufficient accuracy or higher analysis cost. Therefore, how to realize rapid trace amount detection of nitrite and avoid potential harm is a technical problem to be solved by the technical personnel in the field.
Chemical Oxygen demand cod (chemical Oxygen demand) is a chemical method for measuring the amount of reducing substances to be oxidized in a water sample. The oxygen equivalent of a substance (typically an organic substance) that can be oxidized by a strong oxidizing agent in wastewater, wastewater treatment plant effluent, and contaminated water. In the research of river pollution and the property of industrial wastewater and the operation management of wastewater treatment plants, it is an important and relatively fast measurable organic pollution parameter, often denoted by the symbol COD. It reflects the degree of contamination of the water by reducing substances. The index is also one of the comprehensive indexes of the relative content of organic matters. The high chemical oxygen demand means that water contains a large amount of reducing substances, and means that the more serious the organic contamination in water, the more the sources of the organic contamination may be agricultural chemicals, chemical plants, organic fertilizers, and the like. If not treated, a plurality of organic pollutants can be adsorbed by the bottom mud at the bottom of the river to be deposited, and the organic pollutants can cause lasting toxic action on aquatic organisms within a plurality of years in the future. After massive death of aquatic life, the ecosystem in the river is destroyed. If people eat organisms in water, a large amount of toxins in the organisms are absorbed and accumulated in the bodies, and the toxins have carcinogenic, teratogenic and mutagenic effects and are extremely dangerous to people. The existing detection methods for chemical oxygen consumption mainly comprise a potassium dichromate method, a potassium permanganate method, a spectrophotometric method, a rapid digestion method and the like. However, these methods are either inconvenient to operate, difficult to detect in large quantities, or costly. The existing methods are difficult to realize on-site rapid detection.
Electrochemical methods have received increasing attention in the field of chemical analysis due to their low cost, high sensitivity, simplicity and corresponding high speed, whereas in electrochemical devices the detection limit, sensitivity and linear range are mainly determined by the working electrode. At present, many documents report that the detection of nitrite or COD is realized by designing a working electrode through a nano material, but an effective device is lacked, and the simultaneous real-time on-site detection of nitrite and COD is realized. Therefore, how to prepare a high-efficient stable nitrite detection electrode and chemical oxygen demand detection electrode and quick detection device will be can be fast effectual two kinds of material on-the-spot short-term test of nitrite and COD be the technical problem that technical staff in the field need to solve.
Disclosure of Invention
The invention provides a preparation method of a nitrite detection electrode and a chemical oxygen demand detection electrode and a rapid detection device, aiming at the problems that in the detection method of nitrate and chemical oxygen demand in the prior art, either the precision is insufficient, the detection cost is high, and rapid and on-site detection is difficult to realize.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a nitrite detection electrode is designed, and comprises the following steps: firstly, Fe is deposited on FTO glass by a hydrothermal method2O3And (3) carrying out nano-wire modification on the obtained product by a solution method to obtain the nitrite detection electrode.
Preferably, the particle size of the gold nanoparticles on the surface of the nitrite detection electrode is 3-5 nm.
A preparation method of a chemical oxygen demand detection electrode is designed, and comprises the following steps: firstly, synthesizing and preparing anatase phase TiO with the grain diameter of 5-10nm2A nanoparticle; then 0.1g of anatase phase TiO is selected2Dispersing the nanoparticles into a water and alcohol solution in a ratio of 4: 1; then, after adding 150 mu L of membrane solution, carrying out ultrasonic treatment for 3min by using an ultrasonic pump to obtain emulsion, and obtaining a thin film on FTO glass at a pulling speed of 2cm/min by using a pulling instrument; and finally, drying and annealing at 450 ℃ to obtain the chemical oxygen consumption detection electrode.
A rapid detection device for nitrite content and chemical oxygen demand is designed, which comprises a sample cell and an electrochemical workstation, wherein a nitrite detection electrode, a chemical oxygen demand detection electrode, a reference electrode, a counter electrode, a light source and a stirring paddle are arranged in the sample cell; the nitrite detection electrode is prepared by the preparation method, the chemical oxygen consumption detection electrode is prepared by the method, the nitrite detection electrode and the chemical oxygen consumption detection electrode are connected with an electrochemical workstation through a single-pole double-throw switch, and the reference electrode and the counter electrode are connected with the electrochemical workstation; the light source is connected with a direct current power supply in series, the direct current power supply provides a working power supply, the stirring paddle is driven by a micro motor to operate, the micro motor is connected with the direct current power supply in series, the direct current power supply provides the working power supply, and an adjustable resistor and a single-pole single-throw switch are further connected in series on a circuit between the light source and the direct current power supply and a circuit between the micro motor and the direct current power supply; the portable computer also comprises a nitrite analysis module, a chemical oxygen consumption analysis module and a warning system, and the USB drive module is connected with the nitrite analysis module and the chemical oxygen consumption analysis module; the nitrite analysis module and the chemical oxygen consumption analysis module are also connected with a warning system.
Preferably, the side surface of the sample cell is also provided with a transparent observation window.
Preferably, the bottom end of the sample pool is also provided with a liquid discharge hole.
Preferably, the upper end of the sample cell is also provided with a liquid inlet hole.
Preferably, the chemical oxygen demand detection electrode is fixed by an electrode clamp; the electrode clamp be the cuboid structure, be equipped with the through-hole of the T shape structure of handstand in it, chemical oxygen consumption detection electrode insert from the through-hole upper end and establish the entering.
Preferably, the light source is a 5.8W LED lamp.
Preferably, the output voltage of the direct current power supply is 12V.
The preparation method and the rapid detection device of the nitrite detection electrode and the chemical oxygen demand detection electrode have the beneficial effects that:
(1) the preparation method of the nitrite detection electrode is simple in process, and the prepared nitrite detection electrode is prepared by depositing Fe on FTO glass2O3Nano wire, gold nano particle decoration, FTO glass and Fe2O3And Fe2O3On the interface with the gold nano-particles, Fe atoms can be in a coherent state, so that the FTO glass and Fe2O3And Fe2O3The nano-gold electrode material realizes atomic-level contact and chemical bonding with gold nanoparticles, the distance between two phases is short, the size of atomic diameter is large, the bonding force is far higher than the effects of Van der Waals force and the like, and the conduction of electrons between the two phases is obviously superior to that of the electrode material in the prior art. So that Fe2O3With FTO glass and Fe2O3The nitrite detection electrode prepared by the method has the beneficial effects of high detection precision and quick response time;
(2) the preparation method of the chemical oxygen consumption detection electrode comprises the step of pulling TiO containing anatase phase on FTO glass by a pulling instrument2Emulsion of nanoparticles, film solution, nano TiO2Has increased photocatalytic performance, and can reduce nanometer TiO under the action of electric field2The recombination rate of surface photoproduction electrons and holes can also shorten the diffusion distance of organic matters to the surface of the catalyst and reduce the mass transfer resistance of the surface of the catalyst, thereby effectively improving the response time and the precision of measuring the chemical oxygen consumption by the method; the film solution is added mainly to improve the nano TiO2The chemical oxygen consumption detection electrode prepared by the method has high detection precision and quick response time;
(3) the device is provided with a nitrite detection electrode, a chemical oxygen consumption detection electrode, a reference electrode and a counter electrode, wherein the nitrite detection electrode and the chemical oxygen consumption detection electrode are connected with an electrochemical workstation through a single-pole double-throw switch, so that two three-electrode detection systems are formed, and the device has the advantages of simple and compact structure and capability of simultaneously detecting the nitrite content and the chemical oxygen consumption of a sample; meanwhile, the electrochemical workstation transmits the acquired structure to a nitrite analysis module and a chemical oxygen demand analysis module in a portable computer in real time through the USB driving module, so that the detected nitrite content and the chemical oxygen demand value in the sample can be quickly analyzed through the nitrite analysis module and the chemical oxygen demand analysis module, and early warning is realized;
(4) the device is provided with the light source, so that the catalytic oxidation intensity is increased in the nitrite detection process, and the signal intensity is obviously enhanced; in the chemical oxygen demand detection process, the solution is oxidized through photoelectrocatalysis to generate small molecular substances, so that the electrical conductivity in the solution is changed, the current between electrodes is changed, and the small molecular substances are used for calibrating the concentration of the solution;
(5) the device has the advantages of quick detection result, high detection precision, capability of detecting the nitrite detection content and the chemical oxygen consumption of one sample, low cost, high sensitivity, simple method and convenient carrying, and can be widely applied to the field of quick field detection in the fields of food and environmental monitoring.
Drawings
The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the structure of an electrode holder in the device of the present invention;
FIG. 3 is a graph showing a standard curve obtained by testing a standard value of chemical oxygen demand with glucose concentration in a comparative example of the present invention;
FIG. 4 is a graph showing a standard curve obtained by performing a test using a nitrite concentration as a standard value in a comparative example of the present invention.
In the figure: the device comprises a sample pool 1, an electrochemical workstation 2, a nitrite detection electrode 3, a chemical oxygen demand detection electrode 4, a reference electrode 5, a counter electrode 6, a light source 7, a stirring paddle 8, a single-pole double-throw switch 9, a direct current power supply 10, a micro motor 11, an adjustable resistor 12, a single-pole single-throw switch 13, a portable computer 14, a USB driving module 15, a nitrite analysis module 16, a chemical oxygen demand analysis module 17, an alarm system 18, a transparent observation window 19, a liquid discharge hole 20, a liquid inlet hole 21, an electrode clamp 22 and a through hole 23.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
The invention relates to a preparation method of a nitrite detection electrode, which comprises the following steps: firstly, Fe is deposited on FTO glass by a hydrothermal method2O3And (3) carrying out nano-wire modification on the gold nanoparticles by a solution method to obtain the nitrite detection electrode 3, wherein the particle size of the gold nanoparticles on the surface of the nitrite detection electrode 3 is 3 nm.
The invention relates to a preparation method of a chemical oxygen demand detection electrode, which comprises the following steps: firstly, synthesizing and preparing anatase phase TiO with the particle size of 5nm2A nanoparticle; then 0.1g of anatase phase TiO is selected2Dispersing the nanoparticles into a water and alcohol solution in a ratio of 4: 1; then, after adding 150 mu L of membrane solution, carrying out ultrasonic treatment for 3min by using an ultrasonic pump to obtain emulsion, and obtaining a thin film on FTO glass at a pulling speed of 2cm/min by using a pulling instrument; and finally, drying and annealing at 450 ℃ to obtain the chemical oxygen consumption detection electrode 4.
Referring to the attached drawings 1-2, the device for rapidly detecting nitrite content and chemical oxygen demand of the invention comprises a sample cell 1 and an electrochemical workstation 2, wherein a nitrite detection electrode 3, a chemical oxygen demand detection electrode 4, a reference electrode 5, a counter electrode 6, a light source 7 and a stirring paddle 8 are arranged in the sample cell 1; the nitrite detection electrode 3 is prepared by the method, the chemical oxygen consumption detection electrode 4 is prepared by the method, the nitrite detection electrode 3 and the chemical oxygen consumption detection electrode 4 are connected with the electrochemical workstation 2 through a single-pole double-throw switch 9, and the reference electrode 5 and the counter electrode 6 are connected with the electrochemical workstation 2; the light source 7 is connected in series with a direct current power supply 10, a working power supply is provided by the direct current power supply 10, the stirring paddle 8 is driven by a micro motor 11 to operate, the micro motor 11 is connected in series with the direct current power supply 10 and provided with the working power supply by the direct current power supply 10, and an adjustable resistor 12 and a single-pole single-throw switch 13 are further connected in series on a circuit between the light source 7 and the direct current power supply 10 and a circuit between the micro motor 11 and the direct current power supply 10; the electrochemical workstation 2 is connected with a USB drive module 15 in a portable computer 14, the portable computer 14 further comprises a nitrite analysis module 16, a chemical oxygen consumption analysis module 17 and a warning system 18, and the USB drive module 15 is connected with the nitrite analysis module 16 and the chemical oxygen consumption analysis module 17; the nitrite analysis module 16 and the chemical oxygen consumption analysis module 17 are also connected with a warning system 18.
The side surface of the sample cell 1 is also provided with a transparent observation window 19, the bottom end of the sample cell 1 is also provided with a liquid discharge hole 20, and the upper end of the sample cell 1 is also provided with a liquid inlet hole 21; the chemical oxygen consumption detection electrode 4 is fixed through an electrode clamp 22; electrode holder 22 be the cuboid structure, be equipped with the through-hole 23 of the T shape structure of handstand in it, COD detection electrode 4 insert from through-hole 23 upper end and establish the entering, light source 7 be 5.8W's LED lamp, DC power supply 10's output voltage be 12V.
Example two
The invention relates to a preparation method of a nitrite detection electrode, which comprises the following steps: firstly, Fe is deposited on FTO glass by a hydrothermal method2O3And (2) carrying out nano-wire modification on the gold nanoparticles by a solution method to obtain the nitrite detection electrode 3, wherein the particle size of the gold nanoparticles on the surface of the nitrite detection electrode 3 is 4 nm.
The invention relates to a preparation method of a chemical oxygen demand detection electrode, which comprises the following steps: firstly, synthesizing and preparing anatase phase TiO with the particle size of 7nm2A nanoparticle; then 0.1g of anatase phase TiO is selected2Dispersing the nanoparticles into a water and alcohol solution in a ratio of 4: 1; then, after adding 150 mu L of membrane solution, carrying out ultrasonic treatment for 3min by using an ultrasonic pump to obtain emulsion, and obtaining a thin film on FTO glass at a pulling speed of 2cm/min by using a pulling instrument; and finally, drying and annealing at 450 ℃ to obtain the chemical oxygen consumption detection electrode 4.
Referring to the attached drawings 1-2, the device for rapidly detecting nitrite content and chemical oxygen demand of the invention comprises a sample cell 1 and an electrochemical workstation 2, wherein a nitrite detection electrode 3, a chemical oxygen demand detection electrode 4, a reference electrode 5, a counter electrode 6, a light source 7 and a stirring paddle 8 are arranged in the sample cell 1; the nitrite detection electrode 3 is prepared by the method, the chemical oxygen consumption detection electrode 4 is prepared by the method, the nitrite detection electrode 3 and the chemical oxygen consumption detection electrode 4 are connected with the electrochemical workstation 2 through a single-pole double-throw switch 9, and the reference electrode 5 and the counter electrode 6 are connected with the electrochemical workstation 2; the light source 7 is connected in series with a direct current power supply 10, a working power supply is provided by the direct current power supply 10, the stirring paddle 8 is driven by a micro motor 11 to operate, the micro motor 11 is connected in series with the direct current power supply 10 and provided with the working power supply by the direct current power supply 10, and an adjustable resistor 12 and a single-pole single-throw switch 13 are further connected in series on a circuit between the light source 7 and the direct current power supply 10 and a circuit between the micro motor 11 and the direct current power supply 10; the electrochemical workstation 2 is connected with a USB drive module 15 in a portable computer 14, the portable computer 14 further comprises a nitrite analysis module 16, a chemical oxygen consumption analysis module 17 and a warning system 18, and the USB drive module 15 is connected with the nitrite analysis module 16 and the chemical oxygen consumption analysis module 17; the nitrite analysis module 16 and the chemical oxygen consumption analysis module 17 are also connected with a warning system 18.
The side surface of the sample cell 1 is also provided with a transparent observation window 19, the bottom end of the sample cell 1 is also provided with a liquid discharge hole 20, and the upper end of the sample cell 1 is also provided with a liquid inlet hole 21; the chemical oxygen consumption detection electrode 4 is fixed through an electrode clamp 22; electrode holder 22 be the cuboid structure, be equipped with the through-hole 23 of the T shape structure of handstand in it, COD detection electrode 4 insert from through-hole 23 upper end and establish the entering, light source 7 be 5.8W's LED lamp, DC power supply 10's output voltage be 12V.
EXAMPLE III
The invention relates to a preparation method of a nitrite detection electrode, which comprises the following steps: firstly, Fe is deposited on FTO glass by a hydrothermal method2O3Nanowire and method of manufacturing the sameAnd then, further modifying gold nanoparticles by a solution method to obtain the nitrite detection electrode 3, wherein the particle size of the gold nanoparticles on the surface of the nitrite detection electrode 3 is 5 nm.
The invention relates to a preparation method of a chemical oxygen demand detection electrode, which comprises the following steps: firstly, synthesizing and preparing anatase phase TiO with the grain diameter of 10nm2A nanoparticle; then 0.1g of anatase phase TiO is selected2Dispersing the nanoparticles into a water and alcohol solution in a ratio of 4: 1; then, after adding 150 mu L of membrane solution, carrying out ultrasonic treatment for 3min by using an ultrasonic pump to obtain emulsion, and obtaining a thin film on FTO glass at a pulling speed of 2cm/min by using a pulling instrument; and finally, drying and annealing at 450 ℃ to obtain the chemical oxygen consumption detection electrode 4.
Referring to the attached drawings 1-2, the device for rapidly detecting nitrite content and chemical oxygen demand of the invention comprises a sample cell 1 and an electrochemical workstation 2, wherein a nitrite detection electrode 3, a chemical oxygen demand detection electrode 4, a reference electrode 5, a counter electrode 6, a light source 7 and a stirring paddle 8 are arranged in the sample cell 1; the nitrite detection electrode 3 is prepared by the method, the chemical oxygen consumption detection electrode 4 is prepared by the method, the nitrite detection electrode 3 and the chemical oxygen consumption detection electrode 4 are connected with the electrochemical workstation 2 through a single-pole double-throw switch 9, and the reference electrode 5 and the counter electrode 6 are connected with the electrochemical workstation 2; the light source 7 is connected in series with a direct current power supply 10, a working power supply is provided by the direct current power supply 10, the stirring paddle 8 is driven by a micro motor 11 to operate, the micro motor 11 is connected in series with the direct current power supply 10 and provided with the working power supply by the direct current power supply 10, and an adjustable resistor 12 and a single-pole single-throw switch 13 are further connected in series on a circuit between the light source 7 and the direct current power supply 10 and a circuit between the micro motor 11 and the direct current power supply 10; the electrochemical workstation 2 is connected with a USB drive module 15 in a portable computer 14, the portable computer 14 further comprises a nitrite analysis module 16, a chemical oxygen consumption analysis module 17 and a warning system 18, and the USB drive module 15 is connected with the nitrite analysis module 16 and the chemical oxygen consumption analysis module 17; the nitrite analysis module 16 and the chemical oxygen consumption analysis module 17 are also connected with a warning system 18.
The side surface of the sample cell 1 is also provided with a transparent observation window 19, the bottom end of the sample cell 1 is also provided with a liquid discharge hole 20, and the upper end of the sample cell 1 is also provided with a liquid inlet hole 21; the chemical oxygen consumption detection electrode 4 is fixed through an electrode clamp 22; electrode holder 22 be the cuboid structure, be equipped with the through-hole 23 of the T shape structure of handstand in it, COD detection electrode 4 insert from through-hole 23 upper end and establish the entering, light source 7 be 5.8W's LED lamp, DC power supply 10's output voltage be 12V.
Comparative example
The device of the third embodiment of the invention is used for carrying out chemical oxygen demand detection by taking the glucose concentration as a standard value and carrying out nitrite content detection by taking the nitrite concentration as a standard value. Referring to FIG. 3, the glucose concentration is used as the standard value of the chemical oxygen demand for testing, a standard curve is obtained, linear fitting is carried out, and the correlation coefficient can reach R > 0.998; referring to FIG. 4, the nitrite concentration is taken as a standard value for testing and obtaining the standard, and the correlation coefficient R is more than 0.999; as can be seen from the attached figures 3 and 4, the device has wide detection range of chemical oxygen demand and nitrite content and high corresponding correlation coefficient.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A preparation method of a nitrite detection electrode is characterized by comprising the following steps: firstly, Fe is deposited on FTO glass by a hydrothermal method2O3And (3) carrying out nano-wire modification on the obtained product by a solution method to obtain the nitrite detection electrode (3).
2. The method for preparing the nitrite detection electrode according to claim 1, wherein the particle size of the gold nanoparticles on the surface of the nitrite detection electrode (3) is 3-5 nm.
3. A rapid detection device for nitrite content and chemical oxygen demand comprises a sample cell (1) and an electrochemical workstation (2), and is characterized in that a nitrite detection electrode (3), a chemical oxygen demand detection electrode (4), a reference electrode (5), a counter electrode (6), a light source (7) and a stirring paddle (8) are arranged in the sample cell (1); the nitrite detection electrode (3) is prepared by the preparation method of claim 1, the nitrite detection electrode (3) and the chemical oxygen demand detection electrode (4) are connected with an electrochemical workstation (2) through a single-pole double-throw switch (9), and the reference electrode (5) and the counter electrode (6) are connected with the electrochemical workstation (2); the light source (7) is connected with a direct current power supply (10) in series, the direct current power supply (10) provides a working power supply, the stirring paddle (8) is driven by a micro motor (11) to operate, the micro motor (11) is connected with the direct current power supply (10) in series, the direct current power supply (10) provides the working power supply, and an adjustable resistor (12) and a single-pole single-throw switch (13) are also connected in series on a circuit between the light source (7) and the direct current power supply (10) and a circuit between the micro motor (11) and the direct current power supply (10);
the electrochemical workstation (2) is connected with a USB drive module (15) in a portable computer (14), the portable computer (14) further comprises a nitrite analysis module (16), a chemical oxygen consumption analysis module (17) and a warning system (18), and the USB drive module (15) is connected with the nitrite analysis module (16) and the chemical oxygen consumption analysis module (17); the nitrite analysis module (16) and the chemical oxygen consumption analysis module (17) are also connected with a warning system (18).
4. The rapid detection device for nitrite content and chemical oxygen demand according to claim 3, wherein a transparent observation window (19) is further arranged on the side surface of the sample cell (1).
5. The rapid detection device for nitrite content and chemical oxygen demand according to claim 3, wherein a drain hole (20) is further disposed at the bottom end of the sample cell (1).
6. The rapid detection device for nitrite content and chemical oxygen demand according to claim 3, wherein the upper end of the sample cell (1) is further provided with a liquid inlet hole (21).
7. The rapid detection device for nitrite content and chemical oxygen demand according to claim 3, wherein the chemical oxygen demand detection electrode (4) is fixed by an electrode clamp (22); electrode holder (22) be the cuboid structure, be equipped with through-hole (23) of the T shape structure of handstand in it, COD detection electrode (4) insert from through-hole (23) upper end and establish the entering.
8. The device for rapidly detecting nitrite content and chemical oxygen demand as claimed in claim 3, wherein said light source (7) is a 5.8W LED lamp.
9. The apparatus for rapidly detecting nitrite content and chemical oxygen demand as claimed in claim 3, wherein the output voltage of said DC power supply (10) is 12V.
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| α-Fe2O3 nanorod arrays for bioanalytical applications: nitrite and hydrogen peroxide detection;Liu, Liu et al.;《RSC Advances》;20130322;第3卷(第22期);全文 * |
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