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Method for analyzing content of hexavalent chromium in coal ash through ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) method

A technology of hexavalent chromium and coal ash, which is applied in thermal excitation analysis, material excitation analysis, preparation of test samples, etc., can solve the problems of insufficient and high test results of hexavalent chromium, achieve oxidation inhibition, high sensitivity, avoid effect of influence

Inactive Publication Date: 2017-05-31
淮南市产品质量监督检验所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a method for analyzing the content of hexavalent chromium in coal ash by ICP-OES method, which solves the problem that the test result of hexavalent chromium in coal ash is too high, not sensitive enough and accurate in the prior art question

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  • Method for analyzing content of hexavalent chromium in coal ash through ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) method
  • Method for analyzing content of hexavalent chromium in coal ash through ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) method
  • Method for analyzing content of hexavalent chromium in coal ash through ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) method

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Embodiment I

[0058] The present embodiment ICP-OES method analyzes the method for hexavalent chromium content in coal ash, comprises the following steps:

[0059] S1. Weigh the coal ash sample and place it in a 60ml digestion tank, add 8ml of alkaline extract, and at the same time add 60mg of MgCl2 and 0.05ml of 1mol / L phosphate buffer solution, put the digestion tank into a microwave digestion instrument for digestion , after the digestion is completed, transfer the solubilized coal ash sample to the filter device, rinse it with deionized water for at least 3 times, and then transfer it to the filter device together with the rinse solution, and filter it with a membrane with a thickness of 0.4 μm. Rinse the inner edge and inner pad of the funnel with deionized water, transfer the filtrate and rinsing solution to a 100ml volumetric flask, use deionized water to make up the volume, shake well, and obtain the original solution for alkali digestion;

[0060] S2. Take 15ml of the alkali digest...

Embodiment 2

[0065] The present embodiment ICP-OES method analyzes the method for hexavalent chromium content in coal ash, comprises the following steps:

[0066] S1. Weigh the coal ash sample and place it in a 70ml digestion tank, add 10ml of alkaline extract, add 80mg of MgCl2 and 0.1ml of 1mol / L phosphate buffer solution at the same time, put the digestion tank into a microwave digestion instrument for digestion , after the digestion is completed, transfer the solubilized coal ash sample to the filter device, wash it with deionized water for at least 3 times continuously, and then transfer it to the filter device together with the rinse solution, and filter it with a membrane with a thickness of 0.45 μm. Rinse the inner edge and inner pad of the funnel with deionized water, transfer the filtrate and rinsing solution to a 100ml volumetric flask, use deionized water to make up the volume, shake well, and obtain the original solution for alkali digestion;

[0067] S2. Put 20ml of the alkal...

Embodiment 3

[0072] The present embodiment ICP-OES method analyzes the method for hexavalent chromium content in coal ash, comprises the following steps:

[0073] S1. Weigh the coal ash sample and place it in a 90ml digestion tank, add 12ml of alkaline extract, add 90mg of MgCl2 and 0.2ml of 1mol / L phosphate buffer solution at the same time, put the digestion tank into a microwave digestion instrument for digestion , after the digestion is completed, transfer the solubilized coal ash sample to the filter device, rinse it with deionized water for at least 3 times continuously, and then transfer it to the filter device together with the rinse solution, and filter it with a membrane with a thickness of 0.5 μm. Rinse the inner edge and inner pad of the funnel with deionized water, transfer the filtrate and rinsing solution to a 100ml volumetric flask, use deionized water to make up the volume, shake well, and obtain the original solution for alkali digestion;

[0074] S2. Put 25ml of the alkal...

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Abstract

The invention provides a method for analyzing the content of hexavalent chromium in coal ash through an ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) method, and relates to the technical field of analyzing testing methods. The method comprises the steps: performing microwave alkaline digestion on a coal ash sample, co-precipitating to separate trivalent chromium, and measuring the content of hexavalent chromium through the ICP-OES. The method has the characteristics of being fast to analyze, high in sensitivity, high in accuracy and precision, small in matrix interference, and wide in linear scope; the average recovering rate reaches 87.2%; and the detection limit is low to 0.00033 mcg / ml.

Description

technical field [0001] The invention relates to the technical field of analysis and testing methods, and relates to an ICP-OES method for analyzing the hexavalent chromium content in coal ash. Background technique [0002] Coal is the most important fossil energy in my country, and its composition is extremely complex. 81 elements have been detected in coal. In the 1990s, Western countries led by the United States issued a bill to list 11 elements such as Sb, As, Be, Cd, Cr, Co, Pb, Mn, Hg, Ni, and Se as harmful elements for strict control of emissions. Chromium element is one of them. [0003] Chromium is an oxophilic element with a high melting point. It is one of the elements that are difficult to volatilize or have low volatility in coal. Therefore, it is not easy to volatilize during coal combustion, and most of it is enriched in coal ash formed after high-temperature combustion. The total chromium content can be as high as 150 μg / g. Chromium exists mainly in two ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/44
CPCG01N21/73G01N1/44
Inventor 闫玉乐张杰芳张海侠焦发存胡云虎周博涵夏承莉蒋旭张帅刘衢州张晔张雯王宇鲍继伦
Owner 淮南市产品质量监督检验所
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