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Method of measuring bromine in coal with high temperature hydrolysis and bromine ion selective electrode

A high-temperature hydrolysis and selective electrode technology, applied in the direction of material electrochemical variables, to achieve the effect of eliminating the memory effect of the pipeline, eliminating the matrix effect, and reducing the detection limit

Inactive Publication Date: 2016-06-15
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no relevant reports on the influencing factors, the degree of interference of coexisting ions and the optimal conditions for the determination of bromine in coal by bromine ion selective electrodes.

Method used

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  • Method of measuring bromine in coal with high temperature hydrolysis and bromine ion selective electrode

Examples

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Embodiment 1

[0028] The method for the pyrohydrolysis-bromine ion selective electrode of the present embodiment to measure bromine in coal is carried out according to the following steps:

[0029] (1) Draw a standard curve:

[0030] Use an electronic balance to accurately weigh 1.19g of premium pure potassium bromide dried at 120°C for 2 hours in a beaker, add deionized water and stir thoroughly, and after fully dissolved, transfer it to a 1000ml volumetric flask and rinse with deionized water Beaker and glass rod 2-3 times, add each washing solution to the volumetric flask and make it up to the mark, shake well, and store in a plastic bottle for later use;

[0031] Take 1ml, 3ml, 5ml, 7ml, 9ml of the above-mentioned standard solution respectively, pour into five 100ml volumetric flasks rinsed with deionized water in turn and number them, then add 10ml of TISAB total ionic strength adjustment buffer solution, and finally use deionized water Dilute to 100ml and shake well for later use to ...

Embodiment 2

[0045] Under this condition, the same experimental method as above was used to test the rock standard sample GBW07406 (GSS-6) (the bromine content is 8.0±0.7μg·g -1 ), the bromine content in rock standard samples was tested many times, and the results of the bromine content in rock standard samples ranged from 7.59 to 8.24 μg·g -1 The test results are all within the error limit specified by the standard material, indicating that this method is feasible for the determination of bromine content in coal and the test results can meet the accuracy requirements.

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Abstract

The invention belongs to the technical field of coal sample detection and particularly relates to a method of measuring bromine in coal with high temperature hydrolysis and a bromine ion selective electrode. The method includes the steps of firstly drawing a standard curve of logarithm of Br<-> concentration to response potential, performing high temperature hydrolysis to the coal sample, with a NaOH solution as an absorption solution for bromine, measuring the electric potential of the pyrolysis liquid after bromine absorption, and calculating the content of bromine in coal. The method is economical and simple and is free of expensive instruments, and can be widely used for daily analysis of the bromine content in coal and other geological samples.

Description

technical field [0001] The invention belongs to the technical field of coal sample detection, and in particular relates to a high-temperature hydrolysis-bromine ion selective electrode method for measuring bromine in coal. Background technique [0002] Bromine is a relatively active element that has an important impact on natural activities. Bromine in the atmosphere has a great impact on the greenhouse effect and the destruction of the ozone layer. Bromate is a possible carcinogen. At the same time, bromine entering the human body through the food chain will cause bromine poisoning symptoms such as skin rashes, central nervous system failure, mental deterioration, and acne. Fossil fuel combustion is one of the important anthropogenic bromine sources in the atmosphere. Therefore, the accurate determination of bromine content in coal is the basic work for studying the environmental geochemical characteristics of bromine in coal and the migration and transformation of bromine ...

Claims

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Application Information

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IPC IPC(8): G01N27/49
CPCG01N27/49
Inventor 周新华刘丹齐庆杰董子文吴宪于文惠王欢
Owner LIAONING TECHNICAL UNIVERSITY
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