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Detection method for oxidable contaminant in aqueous sample

A pollutant and sample technology, applied in the field of chemical analysis, can solve problems affecting measurement results, signal deviation, etc.

Active Publication Date: 2014-07-16
DANAHER SHANGHAI IND INSTR TECH R&D
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the LCK method is that the signal measurement time needs to be accurately between 1-1.5min, otherwise the signal will be significantly shifted, which will affect the measurement results

Method used

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  • Detection method for oxidable contaminant in aqueous sample
  • Detection method for oxidable contaminant in aqueous sample
  • Detection method for oxidable contaminant in aqueous sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Embodiment 1: Determination of the potassium permanganate index based on the low range of ferrous iron

[0104] Reagent: 1:3 sulfuric acid, slowly add 1 part of 96%-98% sulfuric acid to 3 parts of water, cool and set aside; 2mmol / L potassium permanganate solution; 10mmol / L ferrous ammonium sulfate solution; indication The agent is 1.222g / L o-phenanthroline solution.

[0105] COD standard sample: Gradiently dilute the 208ppm COD standard sample (GBW(E)080274) purchased from the National Standards Center to 5.0ppm, 4.0ppm, 3.0ppm, 2.0ppm, 0.5ppm for later use. The COD standard contains glucose as oxidizable. Detection steps:

[0106] 1. Add 5mL COD standard sample into a 16mm diameter glass digestion tube that has been prefilled with 0.25mL 1:3 sulfuric acid;

[0107] 2. Add 0.5mL 2mmol / L potassium permanganate solution, cover and mix well;

[0108] 3. Digest in a preheated 100-degree digester DRB200 for half an hour;

[0109] 4. Immediately after digestion, take o...

Embodiment 2

[0115] Embodiment 2: the comparison of the method for measuring potassium permanganate index of the present invention and other two kinds of absorbance detection methods

[0116] This embodiment compares the absorbance detection method based on the reducing agent of the present invention and two other absorbance detection methods based on potassium permanganate, namely the method of Central Kagaku Company (CKC) in Japan and the LCK 394 TNT of Lange (Lange) in Germany plus vial method. The method of Japan CKC Company is to completely react the water sample with quantitative permanganate, and then directly measure the absorbance of the residual permanganate, while the method of German Lange (Lange) is to first use the water sample with permanganate Oxidation, the residual permanganate is reduced with sodium oxalate, then the residual sodium oxalate is oxidized with a quantitative permanganate standard solution, and finally the absorbance of the residual permanganate after reac...

Embodiment 3

[0143] Embodiment 3: Determination of high range potassium permanganate index based on ferrous iron

[0144] The method of the present invention is also applicable to the determination of the potassium permanganate index in a high range.

[0145] Reagent: 1:3 sulfuric acid, slowly add 1 part of 96-98% concentrated sulfuric acid to 3 parts of water, cool and set aside; 6mmol / L potassium permanganate solution; 12mmol / L ferrous ammonium sulfate solution; The indicator is 1.222g / L o-phenanthroline solution.

[0146] COD standard sample: gradiently dilute the 208ppm COD standard sample (GBW(E)080274) purchased from the National Standards Center to 15.0ppm, 14.0ppm, 13.0ppm, 12.0ppm, 10ppm, 9.0ppm, 8.0ppm, 7.0ppm , 6.0ppm, 5.0ppm, 4.0ppm, 3.0ppm standby. The COD standard contains glucose as oxidizable.

[0147] Detection steps:

[0148] 1. Add 5mL COD standard sample into a 16mm diameter glass digestion tube that has been prefilled with 0.75mL 1:3 sulfuric acid;

[0149] 2. A...

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Abstract

The present invention discloses a method for detecting an oxidable contaminant in an aqueous sample. The method comprises that: a sample reacts with a certain amount of excess permanganate, an excess reducing agent is added, and the residue reducing agent reacts with an indicator at a room temperature so as to detect the amount of the oxidable contaminant in the sample. The invention further discloses a kit for detecting an oxidable contaminant in an aqueous sample.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to a detection method and a kit for oxidizable pollutants in aqueous samples. technical background [0002] The quality of water, especially drinking water, is closely related to human health and quality of life. Human activities have caused a large amount of industrial, agricultural and domestic waste to be discharged into the water, degrading or even polluting the quality of surface water and groundwater. With the growth of population and the development of society, increasing water pollution has become one of the most prominent environmental problems. [0003] Permanganate index is a commonly used index to reflect the pollution degree of organic and inorganic oxides in water bodies, and is an important index to measure environmental quality. The permanganate index refers to the amount consumed when permanganate is used to oxidize certain organic and inorganic reducing substance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 蔡宏王铭玮贾倩刘元嫄王秀华
Owner DANAHER SHANGHAI IND INSTR TECH R&D
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