Method for detecting content of heavy metal in polymeric material and sample treatment method

A polymeric material and sample processing technology, applied in the preparation of test samples, measuring devices, material separation, etc., can solve the problems of high experimental cost, volatilization loss, and easy adsorption

Active Publication Date: 2014-01-08
KUALI GUANGZHOU SUPPLY CHAIN MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the detection of heavy metal content such as lead, mercury, cadmium and chromium in polymer materials in the prior art adopts microwave-assisted digestion method for sample pretreatment, which leads to high experimental cost and is prone to adsorption and volatilization losses to provide a sample pretreatment method suitable for simultaneous and rapid detection of heavy metal content in polymeric materials

Method used

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  • Method for detecting content of heavy metal in polymeric material and sample treatment method
  • Method for detecting content of heavy metal in polymeric material and sample treatment method
  • Method for detecting content of heavy metal in polymeric material and sample treatment method

Examples

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Effect test

Embodiment 1

[0062] In this example, the polymer material sample containing heavy metals lead, cadmium, chromium, and mercury at the same time, ERM-EC681k is selected as a "blind sample" for detection, and the method for detecting the content of heavy metal lead, cadmium, chromium, and mercury in the polymer material, Specifically include the following steps:

[0063] a. Pretreatment of the sample, including the following steps:

[0064] (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 it to 350°C and emit sulfuric acid smoke, the sample is digested and carbonized, thereby polymerizing the material. The heavy metals contained in it all generate their corresponding sulfates, and the organic components are completely carbonized into black substances;

[0065] (2) Concentrated nitric acid with a mass concentration of 68% is added dropwise to the sample carbonized in step (1) and emits...

Embodiment 2

[0074] The lead, cadmium, chromium, and mercury-containing polymer material samples in this example are selected as "blind samples" for detection. ERM-EC680k is used for detection. The methods for detecting the contents of lead, cadmium, chromium and mercury in the polymer materials include the following step:

[0075] a. Pretreatment of the sample, including the following steps:

[0076] (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 350°C and emit sulfuric acid smoke, the sample is decomposed and carbonized, thereby polymerizing the material. The heavy metals contained in it all generate their corresponding sulfates, and the organic components are completely carbonized into black substances;

[0077] (2) Add 65% concentrated nitric acid dropwise to the sample carbonized in step (1) and emit sulfuric acid smoke until the black carbonized material disappears co...

Embodiment 3

[0084] The lead, cadmium, chromium, and mercury-containing polymeric material samples in this embodiment are selected as the "blind sample" for detection. The method for detecting the contents of lead, cadmium, chromium, and mercury in the polymeric material specifically includes the following steps:

[0085] a. Pretreatment of the sample, including the following steps:

[0086] (1) Weigh 0.2g of BW3079 into a beaker, add 3mL of concentrated sulfuric acid with a mass concentration of 95%, place the beaker on a heating plate, heat it to 300°C and emit sulfuric acid smoke. All the heavy metals generate their corresponding sulfates, and the organic components in them are completely carbonized into black substances;

[0087] (2) Add 68% concentrated nitric acid dropwise to the sample carbonized in step (1) and emit sulfuric acid smoke until the black carbonized material disappears completely to obtain a clear sample solution, continue to heat until sulfuric acid smoke is emitted a...

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Abstract

The invention relates to a method for detecting content of heavy metal in a polymeric material. The method includes the following steps: pretreating a sample, namely (1), adding a sufficient or excessive amount of concentrated sulfuric acid in a to-be-detected polymeric material sample, heating until sulfuric acid smoke is generated, and enabling the sample to be decomposed and carbonized; (2), adding a sufficient or excessive amount of concentrated nitric acid in the sample after being treated in the step (1) until carbide disappears and a solution is clear so as to enable the heavy metal to fully exist in the solution in a sulfate manner; (3), adding a sufficient or excessive amount of hydrochloric acid solution in the sample after being treated in the step (2), heating till boiling and maintaining reaction until the sulfate of the heavy metal is completely converted into corresponding chloride, cooling the chloride to obtain a to-be-detected sample solution, and then adopting a detection instrument to detect the content of the heavy metal in the to-be-detected sample solution. By the method, adsorption and volatilization loss of the heavy metal can be avoided, and detection results are high in accuracy; the method is supportive of large-scale operation and visual reaction phenomenon, and low in experiment cost.

Description

technical field [0001] The invention relates to a method for detecting the content of heavy metals in polymeric materials by an open digestion method and a method for processing the polymeric material samples, belonging to the technical field of heavy metal analysis and testing. Background technique [0002] Polymeric material is a kind of high molecular polymer, which refers to the general term of polymer materials formed by small molecular compounds through polymerization reaction. Due to its unique properties, it is widely used in consumer electronic products, toys, tools, daily necessities, etc. In the manufacture of metal, it has become a medium that people frequently come into contact with, and polymeric materials that may contain heavy metals such as Pb, Hg, Cd, and Cr have also become potential hidden dangers that threaten human health. After the product is discarded, it is more likely to cause pollution of soil, atmosphere, water quality, etc., and further affect hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N30/06G01N21/73G01N21/31G01N30/72
Inventor 蔡庆铭方玉枝边志宏
Owner KUALI GUANGZHOU SUPPLY CHAIN MANAGEMENT CO LTD
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