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Method for determining COD of water body by using nano titanium dioxide powder

A nano-titanium dioxide and chemical oxygen demand technology, applied in the field of chemical analysis, can solve the problems of high pollution, slow measurement time, high price, etc., and achieve the effects of high measurement accuracy, short measurement time and low price

Inactive Publication Date: 2003-04-23
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, potassium dichromate titration and coulometric method are generally used to measure the COD of wastewater, but these methods inevitably have some disadvantages: such as consuming a large amount of concentrated sulfuric acid, expensive silver sulfate and highly polluted potassium dichromate, and simultaneously for To eliminate the interference of chloride ions, it is necessary to add highly toxic mercuric sulfate for masking, and high temperature digestion is required, the reflux time is long, the measurement time is slow (generally 2 to 4 hours), the operation process is cumbersome, and the measurement accuracy is poor and cause environmental pollution

Method used

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  • Method for determining COD of water body by using nano titanium dioxide powder
  • Method for determining COD of water body by using nano titanium dioxide powder
  • Method for determining COD of water body by using nano titanium dioxide powder

Examples

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Effect test

Embodiment 1

[0030] Determination of COD value of sewage water samples from a pharmaceutical factory in Shanghai. Measured by the international standard ISO6066-(E) method, its COD value is 476.1mg / L.

[0031] Measure the COD value of above-mentioned sewage water sample with the method described in the present invention, operate according to the step operation of this method regulation, enumerate key operation now as follows:

[0032] The first step The water sample to be tested is the above-mentioned sewage water sample;

[0033] The third step measures the absorbance A=0.2455 of Cr(III) in the serum at a wavelength of 610nm;

[0034] Step 4 Substitute the value of A into the formula COD=2500A-145.5 to obtain COD=2500×0.2455-145.5=613.8-145.5=468.3 (mg / L) of the above sewage water sample.

[0035] Compared with the result measured by the method of the present invention and the result measured by the international standard ISO6066-(E) method, the deviation is -1.64%.

Embodiment 2

[0037] The COD value of a water sample from a waterworks in Shanghai was measured by the international standard ISO6066-(E) method, and the COD value of the water sample was 6.1mg / L.

[0038] Measure the COD value of above-mentioned water sample with the distortion of method for the present invention, operate according to the step operation of this distortion regulation, now enumerate key operation as follows:

[0039] The first step The water sample to be tested is the above water sample;

[0040] The third step measures the absorbance A=0.1207 of potassium permanganate in the clear liquid at a wavelength of 525nm;

[0041] Step 4 Substitute the value of A into the formula COD=30.4-204.08A to obtain COD=30.94-204.08×0.1207=30.94-24.63=6.31 (mg / L) of the above water sample.

[0042] Compared with the result measured by the deformation of the method of the present invention and the result measured by the international standard ISO6066-(E), the deviation is 3.44%.

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Abstract

The method for determining chemical oxygen demand (COD) of water body by using nano titanium dioxide powder includes the following steps: 1. preparing reaction liquor; 2. potocatalysis and degradation; 3. measuring absorbancy A; and 4. solving COD value.

Description

technical field [0001] The invention relates to a method for measuring the chemical oxygen demand (COD) of water body by using nano-titanium dioxide powder, to be precise, relates to a method for measuring the chemical oxygen demand (COD) of water or waste water by using nano-titanium dioxide powder, which belongs to the technical field of chemical analysis . Background technique [0002] Since the degradation of organic matter in water requires oxygen, the main harm of organic matter pollution to water is manifested in the consumption of dissolved oxygen (DO) in water during the oxidation process. Under specified conditions, the amount of oxygen consumed when a water sample is treated with a strong oxidant, in mgO 2 / L as a unit of value is called chemical oxygen demand (COD). COD is a measure of the pollution degree of reducing substances in water, and it is usually used as one of the indicators of the amount of organic matter in industrial wastewate...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N33/18
Inventor 金利通艾仕云张文李嘉庆鲜跃中高梦南杨娅徐继明
Owner EAST CHINA NORMAL UNIVERSITY
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