Method and device for eliminating influence of hydrogen peroxide on COD (Chemical Oxygen Demand) determination

A hydrogen peroxide and scavenging agent technology, applied in the field of chemical analysis, can solve the problems affecting the accurate measurement of COD results and the loss of volatile organic compounds, and achieve the effects of avoiding the loss of volatile organic components, eliminating the impact, and simple operation

Pending Publication Date: 2022-08-05
广州亿新建设集团有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, using the above method, after aeration to remove residual Na 2 SO 3 There is a potential risk of volatile organic compound loss in the process, which affects the accurate determination of COD results

Method used

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  • Method and device for eliminating influence of hydrogen peroxide on COD (Chemical Oxygen Demand) determination
  • Method and device for eliminating influence of hydrogen peroxide on COD (Chemical Oxygen Demand) determination
  • Method and device for eliminating influence of hydrogen peroxide on COD (Chemical Oxygen Demand) determination

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1: the COD determination of artificial configuration containing H2O2 phenol solution;

[0043] Formulated to contain 80mg / L phenol and 400mg / L H 2 O 2 Solution, the measured value of COD is 367mg / L, of which 80mg / L phenol contributes 200mg / L COD. Take 20mLH 2 O 2 Add the water sample to reaction tube 1, then add 1 mL of 10% H 2 SO 4 solution, H 2 O 2Undetectable, but residual Na 2 SO 3 As a result, the COD value rose to 600 mg / L. Add 0.5mL (1+6)H to reaction tube 1 2 SO 4 solution, then pass oxygen; fix the reaction tube 1 on the shaker 5, shake at 200 rev / min for 30min, Na 2 SO 3 If it cannot be detected, the COD concentration of the re-tested water sample is 195mg / L, which is not much different from the COD of phenol solution of 200mg / L, and the difference is within the 5% error range of the COD determination method.

Embodiment 2

[0044] Example 2: COD determination of leather wastewater after Fenton treatment;

[0045] The COD concentration of the leather wastewater sample is 230mg / L (water sample after biological treatment), which is treated by Fenton oxidation. The reaction conditions are as follows: pH=4, H 2 O 2 Concentration 400mg / L, Fe 2 +Concentration 35mg / L, reaction time 2h, sample H after Fenton treatment 2 O 2 The concentration is 185mg / L, and the measured COD concentration is 223mg / L, after deducting 185mg / LH 2 O 2 Contribution of 75mg / L COD, the actual COD concentration of remaining organic matter in leather wastewater is 148mg / L. The samples after Fenton treatment were treated with the above method to eliminate H 2 O 2 Influence on COD determination: take 20mLH 2 O 2 Add water sample to reaction tube 1, then add 1 mL of 10% Na 2 SO 3 solution; add 0.5mL (1+6)H 2 SO 4 The solution was then fed with oxygen; the reaction tube 1 was shaken on the shaker 5 at 200 rpm for 30 min. ...

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Abstract

The invention relates to the technical field of chemical analysis, in particular to a method and a device for eliminating influence of hydrogen peroxide on COD (chemical oxygen demand) determination, and the method for eliminating influence of hydrogen peroxide on COD determination comprises the following steps: adding 20-25ml of H2O2 water sample and 1ml of H2O2 eliminating agent into a reaction tube, and uniformly mixing; 0.5 ml of an H2SO4 solution is added into the reaction tube, and oxygen is introduced into the reaction tube; placing the reaction tube on an oscillator, and uniformly mixing until the H2O2 eliminating agent is completely oxidized, so as to obtain a sample; residual Na2SO3 is eliminated in a sealed oxygen supply mode, volatile organic component loss caused by an aeration or mechanical stirring oxygen supply mode can be avoided, it is ensured that H2O2 interference is eliminated in the COD measurement process, meanwhile, other influences causing increase or reduction of the COD measurement result are not introduced, the influence of hydrogen peroxide on COD measurement can be rapidly eliminated, and operation is easy.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a method and a device for eliminating the influence of hydrogen peroxide on COD measurement. Background technique [0002] Accurate determination of COD has always been a difficult problem for Fenton applications, because the residual hydrogen peroxide in water samples contributes COD, resulting in COD measurement values ​​that cannot accurately reflect the concentration of organic matter; although TOC and DOC are widely used to characterize the degree of mineralization of Fenton oxidation, COD It is still a key indicator for judging whether the sewage treatment meets the standard and evaluating the utilization rate of hydrogen peroxide. Therefore, it is more practical to use COD to evaluate the treatment effect of Fenton. [0003] At present, a COD elimination measurement process H is disclosed. 2 O 2 interference method, i.e. based on Na 2 SO 3 Reduction and O 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N1/28G01N1/38
CPCG01N33/1806G01N1/28G01N1/38Y02W10/10
Inventor 蓝应伦王勇
Owner 广州亿新建设集团有限公司
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