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Method for Eliminating Mercury Memory Effect in Mercury Measurement by Inductively Coupled Plasma Mass Spectrometer

A volume mass spectrometer and inductive coupling technology, applied in the field of ion mass spectrometer measurement, can solve the problems of long cleaning time, cumbersome steps, narrow mercury concentration range, etc., and achieve high cleaning efficiency, simple and convenient method, and short cleaning time Effect

Inactive Publication Date: 2018-11-13
济南市环境监测中心站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the above method is that the cleaning time is still relatively long, and the steps are cumbersome, and the range of mercury concentration in the applicable sample is relatively narrow, which cannot exceed 0.05mg / L

Method used

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  • Method for Eliminating Mercury Memory Effect in Mercury Measurement by Inductively Coupled Plasma Mass Spectrometer
  • Method for Eliminating Mercury Memory Effect in Mercury Measurement by Inductively Coupled Plasma Mass Spectrometer
  • Method for Eliminating Mercury Memory Effect in Mercury Measurement by Inductively Coupled Plasma Mass Spectrometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Steps for cleaning the pipeline with cleaning fluid when the inductively coupled plasma mass spectrometer measures mercury: During the cleaning process, first use a peristaltic pump to quickly absorb the cleaning fluid at a speed of 48rpm to rinse the pipeline for 15s, and then slowly absorb the cleaning fluid at a rotational speed of 24rpm to rinse the pipeline for 15s; The solution is a mixed solution composed of ascorbic acid, thiourea and hydrochloric acid. In the mixed solution, in terms of mass concentration, ascorbic acid is 0.05%, and thiourea is 0.1%; in terms of volume, hydrochloric acid is 3%. All are high-grade pure standard reagents; the experimental water is ultra-pure water (resistivity > 18 MΩ); the mercury concentration in the sample to be tested is 0.5mg / L.

[0031] The cleaning time of the present invention is 30s, and the method in the background technology needs 60s altogether, and the cleaning time of the present invention shortens half compared wit...

Embodiment 2

[0033] Steps for cleaning the pipeline with cleaning fluid when the inductively coupled plasma mass spectrometer measures mercury: During the cleaning process, first use a peristaltic pump to quickly absorb the cleaning fluid at a speed of 48rpm to flush the pipeline for 12s, and then slowly absorb the cleaning fluid at a rotational speed of 24rpm to rinse the pipeline for 18s; The solution is a mixed solution composed of ascorbic acid, thiourea and hydrochloric acid. In the mixed solution, in terms of mass concentration, ascorbic acid is 0.05%, and thiourea is 0.1%; in terms of volume, hydrochloric acid is 3%. All are high-grade pure standard reagents; the experimental water is ultra-pure water (resistivity > 18 MΩ); the mercury concentration in the sample to be tested is 0.05mg / L.

[0034] According to the operation of Example 2, after using the cleaning solution to quickly flush the pipeline for 12s, the absolute response value of mercury dropped rapidly from 25000 to about ...

Embodiment 3

[0043] Cleaning steps of pipeline cleaning with cleaning liquid when inductively coupled plasma mass spectrometer measures mercury: During the cleaning process, first use a peristaltic pump to quickly absorb cleaning liquid at a speed of 40 rpm to rinse the pipeline for 10 seconds, and then slowly absorb cleaning liquid at a rotational speed of 20 rpm to rinse the pipeline for 20 seconds; The solution is a mixed solution composed of ascorbic acid, thiourea and hydrochloric acid. In the mixed solution, in terms of mass concentration, ascorbic acid is 0.05%, and thiourea is 0.1%; in terms of volume, hydrochloric acid is 3%. All are high-grade pure standard reagents; the experimental water is ultra-pure water (resistivity > 18 MΩ); the mercury concentration in the sample to be tested is 0.003mg / L.

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Abstract

The invention belongs to the technical field of ICP-MS measurement and particularly relates to a method of eliminating mercury memory effect during mercury measurement with the ICP-MS. The method includes a step of cleaning a mercury measurement pipe in the ICP-MS, wherein a peristaltic pump quickly sucks a cleaning liquid to wash the pipeline at a high rotation speed at first, and then slowly sucks the cleaning liquid to wash the pipeline at a low rotation speed. The cleaning liquid is a mixture of ascorbic acid, thiourea and inorganic acids. During sample test, the mercury concentration range of a test sample is 0-0.5 mg / L. The method, compared with methods in the background art, is shorter in cleaning time which is reduced by a half. The method has a larger application range, wherein the mercury concentration range of the test sample is 0-0.5 mg / L. The method is simple and convenient and can be completed only with one mixed solution, is high in cleaning efficiency and can effectively eliminate the mercury memory effect during mercury measurement with the ICP-MS, and is suitable for the ICP-MS measurement for mercury in mediums including water, soil, atmosphere particulate matters, etc.

Description

technical field [0001] The invention belongs to the technical field of inductively coupled plasma mass spectrometer measurement, and in particular relates to a method for eliminating mercury memory effect when an inductively coupled plasma mass spectrometer measures mercury. Background technique [0002] Mercury is distributed in a very small amount in nature and is considered a rare metal, but mercury was discovered very early. Mercury can accumulate in organisms and is easily absorbed through the skin as well as the respiratory and digestive tracts. Minamata disease is a type of mercury poisoning. Mercury damages the central nervous system and has adverse effects on the mouth, mucous membranes and teeth. Prolonged exposure to high levels of mercury can cause brain damage and death. Although mercury has a high boiling point, mercury vapor saturated at room temperature has reached several times the poisoning dose. Mercury, as a common environmental heavy metal pollutant,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 战锡林赵翔杜天君李明明王辉郑琳琳
Owner 济南市环境监测中心站