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BDD electrode-based quick COD measuring device

A rapid measurement and electrode technology, applied in the direction of material electrochemical variables, etc., can solve the problems of low oxidation capacity, secondary pollution of the environment, interference detection signal, etc., and achieve the effect of rapid signal response, high mechanical strength, and easy operation

Active Publication Date: 2012-11-21
广东盈峰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Disadvantages of AgO / CuO re-check electrode: low oxidation ability;
[0007] 2. Disadvantages of PbO2 electrode: not resistant to chlorine corrosion, sensitive to iron ions, and there is a risk of heavy metal ion dissolution in acidic or alkaline media, which interferes with the detection signal and causes secondary pollution to the environment

Method used

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  • BDD electrode-based quick COD measuring device

Examples

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Effect test

example 1

[0055] Determination of common pollutants in certain chemical and pharmaceutical wastewater, such as phenol, p-nitrophenol, salicylic acid and cysteamine. Use Ag / AgCl as the reference electrode, apply a voltage of 3.2V, add standard samples (0mg / l, 500mg / l, 1000mg / l) respectively, perform automatic calibration, obtain a calibration curve, and then perform automatic measurement, through data acquisition and processing The circuit collects real-time signals, and can directly read the COD value of the reagent water sample as 1652.1mg / L.

example 2

[0057] Determination of a domestic sewage. Use Ag / AgCl as the reference electrode, apply a voltage of 2.5V, add standard samples (0mg / l, 500mg / l, 1000mg / l) respectively, perform automatic calibration, obtain a calibration curve, and then perform automatic measurement, through data acquisition and processing The circuit collects real-time signals, and can directly read the COD value of the reagent water sample as 39.8mg / L.

example 3

[0059] Determination of a food additive wastewater, the wastewater mainly contains alcohol-based cyclopentanone, acetic acid and diacetyl and other organic substances, using Ag / AgCl as the reference electrode, applying a voltage of 2.4V, adding standard samples (0mg / l, 500mg / l , 1000mg / l), perform automatic calibration, obtain the calibration curve, and then perform automatic measurement, collect real-time signals through the data acquisition and processing circuit, and directly read the COD value of the reagent water sample as 2 498.6 mg / L.

[0060] In summary, compared with the prior art, the present invention has the following advantages: 1. The device of the present invention is easy to operate, takes less time, and responds quickly to signals; 2. No toxic substances are discharged during and after the test, and no secondary Pollution problem; 3. The hydroxyl radical generated on the surface of BDD electrode is a strong oxidant with high redox potential (2.8V), and its redo...

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Abstract

The invention discloses a BDD electrode-based quick COD measuring device, comprising an electrochemistry analysis unit which consists of an electrolytic cell provided with a work electrode, a reference electrode and a counter electrode, wherein the work electrode is a BDD electrode. The electrochemistry analysis unit also comprises a fixed fulcrum bar and a supporting plate connected with the fixed fulcrum bar; the electrolytic cell is arranged on the supporting plate; the upper end of the electrolytic cell is provided with an electrolytic cell cover connected with the fixed fulcrum bar; the supporting bar is provided with a magnetic stirrer; a magnetic rod is arranged at the bottom of the electrolytic cell; a liquid carrying port is arranged on the lateral wall at the bottom part of the electrolytic cell; and a vent nozzle is arranged on the other lateral wall at the bottom part. In the invention, the device has simple and easy operation, short time consumption and quick signal response, and discharges no toxic substance in and after a test procedure, without the problem of secondary pollution; the BDD electrode can fully oxidize organic pollutants in water; and the device has the advantages of high mechanic strength, pollution resistance, corrosion resistance and environment-friendly material, and can realize quick, automatic and continuously running of COD measurement.

Description

technical field [0001] The invention relates to a COD detection device, more specifically to a COD rapid measurement device based on a BDD electrode. Background technique [0002] COD, or chemical oxygen demand, is an important indicator to measure organic pollution in water bodies, and it is also one of the main indicators that require total emission reduction during the "Eleventh Five-Year Plan" period in my country. The national standard method for COD determination is the potassium dichromate reflux method. The potassium dichromate method has the advantages of accurate measurement results and good reproducibility, but its disadvantages are that the method is complex, time-consuming, consumes a lot of medicines, and uses toxic chromium and mercury reagents, causing secondary pollution. [0003] Aiming at the shortcomings of traditional methods and facing the needs of the market, many advanced technologies have been continuously introduced into the COD detection system, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/28G01N27/30
Inventor 王富生周智全王小仙
Owner 广东盈峰科技有限公司