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Method for detecting mercury content in polymeric material and sample processing method

A polymeric material and sample processing technology, applied in the preparation of test samples, analytical materials, measuring devices, etc., can solve the problems of high experimental cost, volatilization loss, mercury adsorption, etc., and achieve high accuracy by avoiding adsorption and volatilization loss , the effect of reducing the cost of experiments

Inactive Publication Date: 2013-12-11
方玉枝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the detection of mercury content in polymeric materials in the prior art adopts microwave-assisted digestion method for sample pretreatment, which leads to high experimental cost, and the problem of mercury adsorption and volatilization loss is easy to occur, and then provides a A Sensitive and Simple Sample Preparation Method for Rapid Detection of Mercury in Polymeric Materials

Method used

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  • Method for detecting mercury content in polymeric material and sample processing method
  • Method for detecting mercury content in polymeric material and sample processing method
  • Method for detecting mercury content in polymeric material and sample processing method

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Embodiment 1

[0053] The mercury-containing polymer material sample described in this embodiment, ERM-EC681k is selected as a "blind sample" for detection, and the detection method of mercury content in the polymer material specifically includes the following steps:

[0054] a. Pretreatment of the sample, specifically including the following steps:

[0055] (1) Weigh 0.3g of ERM-EC681k into a beaker, add 5mL of concentrated sulfuric acid with a mass concentration of 98%, place the beaker on a heating plate, heat to 270°C-280°C and emit sulfuric acid fumes, the sample is digested and carbonized, Thus, all the mercury contained in the polymeric material forms mercury sulfate, and the organic components in it are completely carbonized into black substances;

[0056] (2) Add concentrated nitric acid with a mass concentration of 68% dropwise to the sample that has been carbonized in step (1) and emits sulfuric acid fumes until the black carbonized substance disappears completely, and a clear, co...

Embodiment 2

[0065] The mercury-containing polymer material sample described in this embodiment, ERM-EC680k is selected as a "blind sample" for detection, and the detection method of mercury content in the polymer material specifically includes the following steps:

[0066] a. Pretreatment of the sample, specifically including the following steps:

[0067] (1) Weigh 0.5g of ERM-EC680k into a beaker, add 5mL of concentrated sulfuric acid with a mass concentration of 98%, place the beaker on a heating plate, heat it to 270°C-280°C and emit sulfuric acid fumes, the sample is decomposed and carbonized, Thus, all the mercury contained in the polymeric material forms mercury sulfate, and the organic components in it are completely carbonized into black substances;

[0068] (2) Add concentrated nitric acid with a mass concentration of 65% dropwise to the sample that has been carbonized in step (1) and emits sulfuric acid fumes until the black carbonized substance disappears completely, and a clea...

Embodiment 3

[0075] The mercury-containing polymer material sample described in this embodiment, BW3079 is selected as a "blind sample" for detection, and the method for detecting mercury content in the polymer material specifically includes the following steps:

[0076] a. Pretreatment of the sample, specifically including the following steps:

[0077] (1) Weigh 0.2g of BW3079 into a beaker, add 3mL of concentrated sulfuric acid with a mass concentration of 98%, place the beaker on a heating plate, and heat it to 270°C-280°C to emit sulfuric acid fumes. The sample is decomposed and carbonized, thereby polymerizing the material All the mercury contained in it will generate mercuric sulfate, and the organic components in it will be completely carbonized into black substances;

[0078] (2) Add concentrated nitric acid with a mass concentration of 68% dropwise to the sample that has been carbonized in step (1) and emits sulfuric acid fumes until the black carbonized substance disappears compl...

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Abstract

The invention relates to a method for detecting mercury content in polymeric materials. The method comprises the following steps: a sample is pre-treated at first, namely, (1), taking a polymeric material sample to be detected, adding sufficient or excessive concentrated sulfuric acid, heating until sulphuric acid smoke is generated, so as to dispelling and carbonizing the sample; (2), adding sufficient or excessive concentrated sulfuric acid into the sample processed in the step (1) until carbides disappear and the solution is clear, so as to obtain a solution containing mercury sulfate; (3), heating till boiling, keeping reaction until the mercury sulfate is totally converted into mercuric chloride, and cooling to obtain a sample solution to be detected; then, a detector is adopted to detect the mercury sulfate in the sample solution to be detected. According to the invention, through the adoption of the method, the adsorption and volatile loss of mercury can be avoided, the precision of the detecting result is high, batch operation is realized, and reaction phenomena can be observed, and the experimental cost is low.

Description

technical field [0001] The invention relates to a method for detecting mercury content in polymer materials by an open digestion method and a processing method for samples of the polymer materials, belonging to the technical field of heavy metal analysis and testing. Background technique [0002] Mercury is a highly toxic heavy metal. It is an inhalation poison and has bioaccumulation and amplification effects. It can damage the human brain, nervous system, kidney system and endothelial tissue, and may cause human shock, kidney damage, uremia, and acute kidney disease. Extremely severe symptoms such as exhaustion. What's more serious is that mercury will be transformed into water-soluble organic mercury under certain conditions such as microorganisms, such as methylmercury, which will further enhance its toxic properties, thereby causing serious pollution to water bodies and threatening a wider range human health. Among them, the most typical methylmercury poisoning incide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N21/31G01N27/62G01N1/28G01N27/626
Inventor 蔡庆铭方玉枝
Owner 方玉枝
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