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A kind of test method of permanganate index

A technology of permanganate index and test method, applied in the field of testing

Active Publication Date: 2022-07-12
HANGZHOU GREAN WATER SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing technology The on-line monitoring of permanganate index and laboratory automation instruments have developed rapidly in China in recent years, but the instruments of various manufacturers will have large errors when measuring water samples and environmental standard samples

Method used

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  • A kind of test method of permanganate index
  • A kind of test method of permanganate index

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0120] 1. Using the online permanganate index analyzer produced by Hangzhou Lujie Environmental Technology Co., Ltd.;

[0121] 2. The adjustment of the digestion module is adopted.

[0122] The aluminum block is heated at a constant temperature of 110 °C, and the temperature from normal temperature to the temperature close to boiling is read; the difference between the aluminum block temperature and the reaction cup temperature per second is the ordinate, and the derivative of the reaction pool temperature at the corresponding time is the abscissa. , and perform a straight line fitting to obtain the slope K1. Using the GB11892 method, it is determined that the temperature of boiling water is 100 °C, the difference between the temperature of boiling water and the conical flask per second is the ordinate, the derivative of the temperature of the reaction solution in the conical flask at the corresponding time is the abscissa, and a straight line is fitted to obtain the slope K2 ...

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Abstract

The present invention provides a method for testing permanganate index, comprising: a) mixing a sample to be tested with sulfuric acid solution and potassium permanganate solution, according to t 理想 =94.831‑77.737*exp(‑t / 113.082) is heated to 94.6~94.9 ℃, and oxidation reaction is carried out during the heating process; the volume ratio of the sample to be tested, the sulfuric acid solution and the potassium permanganate solution is 20:1:2; The concentration of the potassium permanganate solution is 0.31~0.33g / L, the concentration of the sulfuric acid solution is 485~495g / L, and the concentration of the sodium oxalate solution is 0.83~0.85g / L; b) adding excess sodium oxalate solution for reduction reaction, then adding dropwise When the potassium permanganate solution changes to the potential value, record the titration time, and the titration rate is 25mL / 1000s; c) The titration time is calculated according to the formula to obtain the permanganate index. The accuracy of the permanganate index measured by the above method is high.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a testing method for permanganate index. Background technique [0002] The permanganate index is one of the basic parameters for surface water quality evaluation, which represents the degree of organic pollution in the water body. [0003] On-line monitoring of permanganate index and laboratory automation instruments in the existing technology have developed rapidly in China in recent years, but instruments from various manufacturers will have large errors when measuring water samples and environmental standard samples. Therefore, it is particularly important to develop a high-accuracy test method for the permanganate index. SUMMARY OF THE INVENTION [0004] In view of this, the purpose of the present invention is to provide a method for testing the permanganate index, and the method has high accuracy. [0005] The invention provides a kind of test method of perma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
CPCG01N31/16Y02A20/20
Inventor 汤杰龙见翔崔海松张立鹏于圣文黄升
Owner HANGZHOU GREAN WATER SCI & TECH INC