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Method and device for electrochemical automatic monitoring of COD combined with water heavy metal ions

A heavy metal ion, automatic monitoring technology, applied in the direction of material electrochemical variables, etc., can solve the problems of not being able to detect the concentration of COD and heavy metal ions at the same time, without considering the influence of temperature, etc., to improve adaptability and test stability, and ensure long-term stability Comparability and good cleaning effect

Active Publication Date: 2014-09-24
SICHUAN BELAM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above patents fail to combine EOD and ASV methods, and cannot detect COD and heavy metal ion concentrations at the same time
Did not make full use of their respective characteristics to meet the needs of practical applications to the greatest extent; did not use ultrasonic methods for water sample digestion, mass transfer and electrode cleaning, did not consider the influence of temperature on COD and heavy metal ion testing, etc.

Method used

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  • Method and device for electrochemical automatic monitoring of COD combined with water heavy metal ions
  • Method and device for electrochemical automatic monitoring of COD combined with water heavy metal ions

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The measuring heads of the working electrode 1 and the auxiliary electrode 2 in the three-electrode system are made of highly doped silicon-based BDD material, the thickness of the silicon wafer is 2 mm, and the thickness of the BDD coating is 20 μm. The working electrode measuring head is round with a diameter of 2mm. The auxiliary electrode measuring head is also circular with a diameter of 10mm. Weld copper wire on the surface of the silicon wafer and package it with a glass tube with an outer diameter of 3mm. The working electrode 1 and the auxiliary electrode 2 are placed relatively parallel with a distance of 10mm; the reference electrode is a saturated calomel electrode, and the measuring head is close to the working electrode with a distance of 1mm. The three electrodes are fixed on the fixed terminals on the top of the integrated electrolytic cell 12 and sealed. The lower end of the measuring head of the auxiliary electrode 2 is 10 mm away from the bottom of t...

Embodiment 2

[0033] Based on the device of Example 1, the present invention can be used for automatic monitoring of the COD and lead ion concentration of lead-acid battery manufacturing wastewater.

[0034] At the beginning of the automatic measurement and sequencing of the device, the electrodes and the inner wall of the integrated electrolytic cell are cleaned first. The sample inlet and discharge device 9 injects 15 mL of distilled water into the integrated electrolytic cell 12, and then applies a positive voltage of 3.0V to the auxiliary electrode (2), while setting the power of the ultrasonic device 10 to 8W for 5 minutes to discharge the distilled water; Start the EOD procedure. The sampling device 9 pumps 10mL, 1mol / L sodium sulfate solution and 5mL waste water, applies a voltage of 2.8V to the auxiliary electrode 2 for 10 minutes, and the current measurement module 7 records the current under the control of the instrument control system 11 The change and its value. During the 10 min...

Embodiment 3

[0039] Based on the device of Embodiment 1 of the present invention, the present invention can also be used for automatic monitoring of the COD and mercury ion concentration of surface water.

[0040] The device starts to measure and sequence automatically, and first clean the electrodes. The sampling device 9 injects 15 mL of distilled water into the integrated electrolytic cell, and then applies a 3.0V voltage to the auxiliary electrode (2), while setting the power of the ultrasonic device 10 to 8W for 5 minutes, and then discharges the distilled water; then, start EOD program. The sampling device 9 pumps 5mL, 1mol / L sodium nitrate, sodium chloride mixed solution and 10mL waste water, and applies a 2.1V voltage to the auxiliary electrode 2 for 10 minutes. The current measurement module 7 is in the instrument control system 11 Record current changes and their values ​​throughout the entire process under control. During the 10 minutes of applying a 2.1V voltage to the auxiliary...

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Abstract

The invention introduces a method and a device for automatic monitoring of water chemical oxygen demand (COD) combined with heavy metal ion concentration. The method is based on a three-electrode system with boron-doped diamond (BDD) membrane electrodes, tests COD of a water sample by an electrochemical anodic oxidation method, and tests heavy metal ion concentration of the water sample by anodic stripping voltammetry (ASV). The BDD electrodes are used both as an anode for testing water sample COD and as a working electrode for testing water sample heavy metal ion concentration, which realizes combined testing of COD and heavy metal ion concentration. With an integrated electrolytic bath, ultrasonic wave and constant temperature measures, the method and the device of the invention are economic and practical, are reliable in testing results, and are good in stability.

Description

technical field [0001] The invention relates to a method and device for online automatic monitoring of water quality chemical oxygen demand (COD) and heavy metal ion concentration in the field of environmental monitoring, in particular to a boron-doped diamond film (BDD) electrode, which is realized by electrochemical anodic oxidation For COD monitoring (EOD) of water samples, anodic stripping voltammetry (ASV) is used to monitor heavy metal ions in water samples. Through the BDD electrode, the EOD method and the ASV method are combined to realize the joint monitoring of water quality COD and heavy metal ion concentration indicators. One instrument can monitor multiple indicators of water quality COD and heavy metal ions at the same time, suitable for online automatic monitoring of industrial wastewater, urban domestic sewage, surface water and drinking water quality, economical and environmentally friendly. Background technique [0002] At present, most of the instruments ...

Claims

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Application Information

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IPC IPC(8): G01N27/27
Inventor 姜赞成胡军谢红利其他发明人请求不公开姓名
Owner SICHUAN BELAM TECH
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