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Apparatus for measuring chemical oxyger requirement by photoelectric concerted catalysis

A technology of chemical oxygen demand and synergistic catalysis, which is applied in the field of devices for measuring chemical oxygen demand by photoelectric synergistic catalysis, and devices for measuring chemical oxygen demand by flow injection analysis. Large errors and other problems, to achieve the effect of improving photocatalytic efficiency, improving sensitivity, and efficient degradation

Inactive Publication Date: 2007-06-06
EAST CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0004] The advantage of the above-mentioned electrocatalytic water body chemical oxygen demand analyzer is that the electrocatalytic method implemented in the analyzer is simple to operate and the analysis time is short. The disadvantage is that the degradation efficiency of the organic matter in the water sample in the analyzer still needs to be improved. When analyzing some refractory water samples, large errors are likely to occur, and the sensitivity needs to be improved

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  • Apparatus for measuring chemical oxyger requirement by photoelectric concerted catalysis
  • Apparatus for measuring chemical oxyger requirement by photoelectric concerted catalysis
  • Apparatus for measuring chemical oxyger requirement by photoelectric concerted catalysis

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Embodiment 1

[0028] Embodiment 1 Photoelectric Synergistic Catalysis Device for Measuring Chemical Oxygen Demand

[0029] This embodiment consists of three parts: a flow injection sampling system, an analysis and detection device, and a data processing system. The flow injection and sampling system includes a mobile phase storage pool, a constant-current peristaltic pump and a micro-sampler. The analysis and detection device includes an auxiliary electrode 2, Reference electrode 3, inlet tube 4, outlet tube 5, upper cover plate 6, lower cover plate 7 and polytetrafluoroethylene film 8, auxiliary electrode 2 is a gold electrode, reference electrode 3 is a saturated calomel electrode or Ag / AgCl The electrodes, the upper cover plate 6 and the lower cover plate 7 are polytetrafluoroethylene plates, and the middle part of the polytetrafluoroethylene film 8 has a gap, and the inlet pipe 4 and the outlet pipe 5 are placed on both sides of the upper cover plate 6 respectively. The electrode 3 is p...

Embodiment 2

[0032] 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.

[0033] When measuring the COD value of above-mentioned water sample with the device of embodiment 1, working electrode 1 is that substrate is TiO 2 PbO 2 electrode, the flow rate of the mobile phase is 0.5mL / min, the central wavelength and power of the ultraviolet light source 10 are 253nm and 11W respectively, and the electrochemical workstation is activated by the computer to apply a working potentia...

Embodiment 3

[0036] 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.

[0037] Measure the COD value of above-mentioned water sample with the device of embodiment 1, the flow velocity of mobile phase is 3.5mL / min, and the central wavelength and power of ultraviolet light source 10 are respectively 253nm and 18W, start electrochemical workstation by computer and apply voltage to working electrode 1 The working potential of the micro-injector is +1.35V, the injection volume of ...

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Abstract

A device to assay the chemical oxygen demand catalyzed by photoelectricity belongs to the environment analysis chemical sensor. The device is the modified product of the traditional water chemical oxygen demand analyzer catalyzed by electricity. The modified part is: the analyzing detecting device is installed with the ultraviolet light resource and the quartz window; the working electrode is the metal oxide modified electrode with the photoelectricity co-catalyzing activity; the working and the assistant electrodes are adhere to the two sides of the lower surface center on upper cover board. It can degrade the water organic matter efficiently and get the water chemical oxygen demand quickly and accurately.

Description

technical field [0001] The present invention relates to a device for measuring chemical oxygen demand by photoelectric synergistic catalysis, more precisely, it relates to an analysis and detection device containing photoelectric synergistic catalytic active metal oxide modified electrode combined with flow injection analysis to measure chemical oxygen demand, which belongs to The technical field of chemical sensors for environmental analysis. 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 slightly ...

Claims

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Application Information

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