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Method for testing potassium permanganate index of water by using ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid))

A technology of potassium permanganate index and potassium permanganate, which is applied in the field of environmental monitoring, can solve the problems of poor correlation of the standard curve, affecting the stability and accuracy of the test results of the permanganate index, and achieves low measurement cost and experimental results. Stable and accurate results

Inactive Publication Date: 2018-03-06
HUAQIAO UNIVERSITY
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Problems solved by technology

Because glucose and potassium hydrogen phthalate can not be fully oxidized by potassium permanganate, the efficiency of being oxidized is a fluctuation range when participating in the reaction, so the correlation of its standard curve is poor when the two substances are made into standard solution. This directly affects the stability and accuracy of the permanganate index test results

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  • Method for testing potassium permanganate index of water by using ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid))

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Embodiment 1

[0026] To measure the permanganate index in a certain river water, the material of the cuvette used is glass or quartz, and the length of the cuvette is 1cm, 2cm, 3cm, 5cm or 10cm.

[0027] (1) Preparation of reagents required for determination: take ABTS (2,2-azino-bis(3-ethyl-benzothiazole-6-sulfonic acid) diammonium salt) and dissolve it in water to prepare a concentration of 0.001-1.000mol / L of the first reagent; the second reagent is 0.1mol / L 1 / 5KMnO 4 Solution; the 3rd reagent is the buffer solution of pH 2.0; The 4th reagent is sulfuric acid solution, and wherein the volume ratio of sulfuric acid and water is 1: 3; The concrete preparation method of above-mentioned each reagent is as follows:

[0028] The first reagent: Dissolve 0.016g of N,N-diethyl-1,4-phenylenediamine salt in 20mL of distilled water or ultrapure water to prepare the first reagent with a concentration of 3mmol / L;

[0029] Second reagent: Dissolve 0.32g of potassium permanganate in about 150mL of dis...

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Abstract

The invention discloses a method for testing potassium permanganate indexes of water by using ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid)). The method comprises the following steps:acidizing a water sample to be tested by using sulfuric acid, adding an excessive amount of a potassium permanganate standard solution, heating to react for a certain time, generating green ABTS freeradicals from the rest potassium permanganate oxidized 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid, testing absorbance values of the ABTS free radicals at characteristic wavelengths of 415nm, 650nm, 732nm or 820nm by using a visible spectrophotometer, calculating the concentration of the rest potassium permanganate, further calculating the consumption of the potassium permanganate according to the concentration of the rest potassium permanganate, and calculating the potassium permanganate indexes of the water sample to be tested. The method is simple to operate, short in testing time and high in testing result precision and stability.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a method for measuring potassium permanganate index in water by using ABTS. Background technique [0002] Permanganate index, also known as potassium permanganate index / oxygen consumption, is a comprehensive indicator that reflects the degree of pollution of surface water by organic pollutants and reducing inorganic substances, and is an important indicator for measuring environmental quality. The latest version of " Hygienic Standards for Drinking Water (GB5749-2006) set oxygen consumption as a routine water quality inspection index. Basically, all water quality monitoring agencies have to test this item every day. At present, the permanganate index in water is generally used The method is sodium oxalate titration method. However, the sodium oxalate titration method is cumbersome to operate and takes a long time to measure. It requires high operatin...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/38
Inventor 邹景刘鑫蔡婳婳苑宝玲
Owner HUAQIAO UNIVERSITY
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