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Method for determining mercury content in hair by DMA-80 direct mercury measuring instrument

A DMA-80, direct technology, applied in the field of analytical chemistry, can solve problems such as little mercury content, and achieve the effects of reduced loss, less pollution, and simple operation

Inactive Publication Date: 2019-11-05
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DMA-80 direct mercury meter is used to detect mercury content, and the main researches focus on blood and urine in water, soil, food and biological samples, and there are few studies on the determination of mercury content in hair

Method used

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  • Method for determining mercury content in hair by DMA-80 direct mercury measuring instrument
  • Method for determining mercury content in hair by DMA-80 direct mercury measuring instrument
  • Method for determining mercury content in hair by DMA-80 direct mercury measuring instrument

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Embodiment Construction

[0020] The present invention is a method for measuring the mercury content in hair with a DMA-80 direct mercury measuring instrument, which is characterized by including the following steps:

[0021] (1) Sample preparation: cut the hair and sample directly; or, after washing the hair with deionized water, soak it in an organic solvent for 5-10 minutes, then dry it in the air and cut it into small pieces for direct sample analysis. Preferably, the organic solvent is acetone.

[0022] (2) Measure with DMA-80 direct mercury meter, the measurement parameters are: the range of drying temperature is 50℃-100℃, and the range of decomposition temperature is 400℃-700℃. Preferably, the sampling amount of hair is 0.0500-1.0000g. Preferably, drying time: 50-70s. Preferably, the decomposition time: 80-100s. Most preferably, the parameters are: drying temperature: 100°C, drying time: 60s; decomposition temperature: 650°C; decomposition time: 90s; starting temperature: 250°C.

[0023] Under the ...

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Abstract

The invention discloses a method for determining the mercury content in hair by a DMA-80 direct mercury measuring instrument. The method comprises the following steps that (1) a sample is prepared bycutting and directly feed hair, or washing the hair with deionized water, immersing the hair by an organic solvent for 5-10min, air-drying the hair naturally, cutting the hair, and feeding the hair directly for analysis; and (2) the DMA-80 direct mercury measuring instrument is used for determination at the drying temperature of 50-100 DEG C and the decomposition range of 400-700 DEG C. Via the method of the invention, pretreatment including microwave digestion or wet digestion is not needed, mercury loss due to a pretreatment method is reduced, operation is simple, pollution is less, detection is rapid, and the accuracy and precision are higher.

Description

Technical field [0001] The invention relates to the field of analytical chemistry, in particular to a method for determining the mercury content in hair. Background technique [0002] Mercury, also known as mercury, is the only metal element that exists in liquid form at room temperature and is widely distributed on the surface of the earth's crust. The application of mercury is very extensive, involving all aspects of society, such as the solution industry, electrical and instrument industry, agriculture, pharmaceutical industry, painting pigments, organic synthesis industry, etc. The main forms of mercury can be divided into elemental mercury, inorganic mercury and organic mercury, which can be bio-enriched thousands of times through the food chain. Mercury can volatilize into mercury vapor at room temperature, and mercury vapor invades the human body through different ways such as the respiratory tract, skin, or digestive tract. It gathers in liver, kidney, brain, heart, bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N1/34G01N27/62G01N21/31G01N27/626
CPCG01N1/44G01N1/34G01N27/62G01N21/31
Inventor 沈梅刘祉嫣骆致
Owner SOUTHERN MEDICAL UNIVERSITY
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