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Method for measuring chemical oxygen requirement by photoelectric concerted catalysis

A technology of chemical oxygen demand and synergistic catalysis, which is applied in the field of environmental analytical chemistry and sensors, can solve the problems that the sensitivity needs to be improved, needs to be improved, and is prone to large errors, etc., and achieves shortened digestion time, high organic degradation efficiency, and accurate detection Effect

Inactive Publication Date: 2007-06-06
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Compared with standard methods, these electrocatalytic and electrophotocatalytic methods have the advantages of simple operation and short analysis time. However, the degradation efficiency of these methods for organic matter in water samples still needs to be improved. In the analysis of some refractory water samples , it is easy to produce large errors, and the sensitivity of these methods needs to be improved

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  • Method for measuring chemical oxygen requirement by photoelectric concerted catalysis
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  • Method for measuring chemical oxygen requirement by photoelectric concerted catalysis

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Embodiment 1

[0044] The chemical oxygen demand (COD) value of a domestic sewage sample in Shanghai was determined by the international standard IS06066-(E) method, and the COD value was 256mg / L. The results of measuring the COD value of the above-mentioned water samples by electrochemical and electro-assisted photocatalytic methods are respectively 235mg / L (parallel determination 7 times, RSD=5.1%) and 241mg / L (parallel determination 7 times, RSD=6.2%), and Compared with the results measured by the international standard IS06066-(E) method, the deviations are -8.2% and -5.8% respectively.

[0045] Measure the COD value of above-mentioned water sample with the method of the present invention, working electrode 1 is that substrate is TiO 2 PbO 2 The specific operation of the electrode is carried out in full accordance with the steps specified in the method, and the following descriptions are now made:

[0046] In the first step, the flow rate of the mobile phase is 0.5mL / min, the central w...

Embodiment 2

[0049] The chemical oxygen demand (COD) value of a sewage sample from a brewery in Shanghai was determined by the international standard IS06066-(E) method, and the COD value was 115mg / L. The results of measuring the COD value of the above water samples by electrochemical and electro-assisted photocatalytic methods are respectively 101mg / L (7 times of parallel determination, RSD=3.9%) and 104mg / L (7 times of parallel determination, RSD=5.1%), and Compared with the results measured by the national standard IS06066-(E) method, the deviations are -11.8% and -9.7% respectively.

[0050] Measure the COD value of above-mentioned water sample with the method described in the present invention, working electrode 1 is that substrate is TiO 2 PbO 2 The specific operation of the electrode is carried out in full accordance with the steps specified in the method, and the following descriptions are now made:

[0051] In the first step, the flow rate of the mobile phase is 3.5mL / min, the c...

Embodiment 3

[0054] The chemical oxygen demand (COD) value of a sewage sample from a pharmaceutical factory in Shanghai was determined by the international standard IS06066-(E) method, and the COD value was 522mg / L. The results of measuring the COD value of the above water samples by electrochemical and electro-assisted photocatalytic methods are respectively 495mg / L (7 times in parallel, RSD=4.2%) and 501mg / L (7 times in parallel, RSD=3.8%), and Compared with the results measured by the national standard IS06066-(E) method, the deviations are -5.2% and -4.0% respectively.

[0055] Measure the COD value of above-mentioned water sample with the method described in the present invention, working electrode 1 is that substrate is TiO 2 PbO 2 The specific operation of the electrode is carried out in full accordance with the steps specified in the method, and the following descriptions are now made:

[0056] In the first step, the flow rate of the mobile phase is 5.0mL / min, the central wavelen...

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Abstract

A device to assay the chemical oxygen demand catalyzed by photoelectricity belongs to the environment analysis chemical and sensor technology field. The analyzing detection device which can receive the ultraviolet light irradiation and the working electrode with the photoelectricity co-catalyzing activity is be used with the traditional flow injecting sampling system and the data processing system. when the ultraviolet light illuminates the working electrode, the computer starts and controls the electrochemical workstation to give +1.1-+1.5V working potential on the working electrode. In the selective flow injecting analyzing condition, a quantity of water sample flow the working electrode, the workstation collects the current response signal of the working electrode which quantity the water chemical oxygen demand.

Description

technical field [0001] The present invention relates to a method for measuring chemical oxygen demand by photoelectric synergistic catalysis, to be precise, it relates to a method of combining an analysis and detection device containing a photoelectric synergistic catalytic active metal oxide modified electrode with flow injection analysis to determine chemical oxygen demand, belonging to Environmental analytical chemistry and sensor technology field. Background technique [0002] Chemical Oxygen Demand (COD) is the measurement of strong oxidants in water, such as Cr 2 o 7 2- , MnO 4 - The equivalent of oxygen required for the oxidation of an oxidized organic substance. At present, the standard reflux method is the most widely used COD determination method at home and abroad. The standard reflux method includes the permanganate index method and the potassium dichromate oxidation method. The former is mainly used in the analysis of groundwater and ...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/30G01N27/00
Inventor 金利通李嘉庆郑蕾李洛平施国跃张文鲜跃仲徐继明吴荣坤庄荣华唐娟马晓婧
Owner EAST CHINA NORMAL UNIVERSITY
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