Method for measuring content of heavy metal in polymer

A detection method and polymer technology, applied in the direction of material excitation analysis, thermal excitation analysis, etc., can solve the problems of long digestion time, large background interference, high viscosity of test solution, etc., and achieve the effect of easy implementation and reduced acid consumption

Inactive Publication Date: 2013-02-13
谱尼测试集团深圳有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional methods for detecting heavy metal content in polymers are mostly wet digestion or microwave digestion. The two methods take a long time to digest and consume a large amount of acid, and it is difficult to digest and clar

Method used

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  • Method for measuring content of heavy metal in polymer
  • Method for measuring content of heavy metal in polymer
  • Method for measuring content of heavy metal in polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] Example: Detection of heavy metals in polytetrafluoroethylene (PTFE).

[0018] Standard curve drawing: configure a series of mixed standard solutions of lead, cadmium, mercury, arsenic, antimony, tin, copper and zinc, and test by ICP-AES. Draw a standard curve with the concentration of each heavy metal as the abscissa and the intensity value as the ordinate. The linear equation and correlation coefficient of the obtained standard curve are shown in Table 2.

[0019] Table 2 Linear equations and correlation coefficients of various heavy metal elements

[0020] Measured element

Linear equation

Correlation coefficient R 2

Pb

y＝3.850x+0.64334

0.9994

Cd

y＝170.36x+3.596

0.9999

Hg

y＝24.65x+0.4462

0.9998

As

y＝9.482x+0.0870

0.9998

Sb

y＝9.229x+0.2991

0.9997

Sn

y＝8.198x-1.873

0.9992

Cu

y＝374.5x-3.565

0.9999

Zn

y＝77.28x-0.4145

0.9997

[0021] The analysis steps of heavy metal content in PTFE are as follows:

[0022] 1. Oxygen bomb co...

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Abstract

The invention relates to a method for measuring the content of a heavy metal in a polymer, and in particular relates to a method for synchronously testing the contents of lead, cadmium, mercury, arsenic, antimony, tin, copper and zinc in the polymer by processing the polymer using oxygen bomb combustion, concentrating absorption liquid, carrying out acid digestion and subsequently using a plasma atomic emission spectrometry (ICP-AES) method. The method for measuring the content of the heavy metal in a polymer material comprises the following steps of: firstly, combusting oxygen bomb, secondly, carrying out acid digestion, and thirdly, testing by using an inductive coupling plasma atomic emission spectrometry instrument. The polymer is sufficiently combusted under a rich oxygen condition by using an oxygen combustion method, the combustion product is absorbed by water, and the absorption liquid is concentrated and subjected to acid digestion; and with the adoption of the method, the treatment to the polymer is efficient, simple, convenient and rapid.

Description

Technical field [0001] The present invention relates to a method for detecting the content of heavy metals. Specifically, the present invention relates to a method for detecting the content of heavy metals in polymers. Background technique [0002] Polymers, also known as high molecular compounds, are compounds with thousands of atoms covalently bonded to each other to form a relatively large molecular weight and repeating structural units. A large number of high-molecular compounds used as materials in the world today are made from low-molecular organic compounds made from coal, petroleum, natural gas, etc., and then through polymerization. Polymer compounds have good mechanical strength, insulation, corrosion resistance, plasticity and high elasticity. In addition, solubility, meltability, solution behavior and crystallinity are also very different from low molecular weight. According to the classification of material properties, polymers can be divided into three categories:...

Claims

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Application Information

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IPC IPC(8): G01N21/71
Inventor 宋薇
Owner 谱尼测试集团深圳有限公司
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