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Method for measuring polyvinyl chloride content in plastic through thermal cracking-gas chromatography mass spectrometry

A technology of gas chromatography mass spectrometry and polyvinyl chloride, which is applied in the field of polyvinyl chloride content determination, and can solve problems such as polyvinyl chloride quantification

Active Publication Date: 2015-01-07
SGS CSTC STANDARDS TECH SERVICES (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the quantitative methods of polyvinyl chloride in plastics, there are currently Fourier transform infrared spectroscopy, thermogravimetric methods, etc., but these methods are difficult to accurately quantify trace amounts of polyvinyl chloride in plastics
However, there are no reports on the detection of trace PVC in plastics by Py-GC-MS

Method used

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  • Method for measuring polyvinyl chloride content in plastic through thermal cracking-gas chromatography mass spectrometry
  • Method for measuring polyvinyl chloride content in plastic through thermal cracking-gas chromatography mass spectrometry
  • Method for measuring polyvinyl chloride content in plastic through thermal cracking-gas chromatography mass spectrometry

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0022] Experimental example 1, the mensuration of polyvinyl chloride in white plastic substrate (as attached figure 2 )

[0023] A sample pretreatment

[0024] (1) Cut the sample into particles smaller than 2mm×2mm×2mm in size, weigh 1.0g sample into a stoppered glass tube;

[0025] (2) Add 25mL tetrahydrofuran, and shake on the shaker for 90 minutes, and pass the sample solution through a 0.45 micron polytetrafluoroethylene membrane;

[0026] (3) Pipette 50 uL of the sample solution into the lysed sample boat, and evaporate to dryness, so that the extract forms a film in the boat.

[0027] B pyrolysis-gas chromatography-mass spectrometry

[0028] The sample boat is placed on the injector of thermal cracking-gas chromatography mass spectrometry, and the instrument parameters are set for automatic analysis.

[0029] The instrument conditions for gas chromatography-mass spectrometry are as follows:

[0030] (1) The gas chromatographic column adopts a weakly polar HP-5MS co...

experiment example 2

[0050]Experimental example 2, the mensuration of polyvinyl chloride in cloth (as attached image 3 )

[0051] A sample pretreatment

[0052] (1) Cut the sample into small pieces smaller than 2mm×2mm in size, weigh 1.0g sample into a stoppered glass tube;

[0053] (2) Add 25mL tetrahydrofuran, and shake on the shaker for 90 minutes, and pass the sample solution through a 0.45 micron polytetrafluoroethylene membrane;

[0054] (3) Pipette 50 uL of the sample solution into the lysed sample boat, and evaporate to dryness, so that the extract forms a film in the boat.

[0055] B pyrolysis-gas chromatography-mass spectrometry

[0056] The sample boat is placed on the injector of thermal cracking-gas chromatography mass spectrometry, and the instrument parameters are set for automatic analysis.

[0057] The instrument conditions for gas chromatography-mass spectrometry are as follows:

[0058] (1) The gas chromatographic column adopts a weakly polar HP-5ms column, and the specifi...

experiment example 3

[0078] Experimental example 3, the mensuration of polyvinyl chloride in plastic tableware (as attached Figure 4 )

[0079] A sample pretreatment

[0080] (1) Cut the sample into particles smaller than 2mm×2mm×2mm in size, weigh 1.0g sample into a stoppered glass tube;

[0081] (2) Add 25mL tetrahydrofuran, and shake on the shaker for 90 minutes, and pass the sample solution through a 0.45 micron polytetrafluoroethylene membrane;

[0082] (3) Pipette 50 uL of the sample solution into the lysed sample boat, and evaporate to dryness, so that the extract forms a film in the boat.

[0083] B pyrolysis-gas chromatography-mass spectrometry

[0084] The sample boat is placed on the injector of thermal cracking-gas chromatography mass spectrometry, and the instrument parameters are set for automatic analysis.

[0085] The instrument conditions for gas chromatography-mass spectrometry are as follows:

[0086] (1) The gas chromatographic column adopts a weakly polar HP-5ms column, ...

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Abstract

The invention relates to a method for measuring polyvinyl chloride content in plastic through thermal cracking-gas chromatography mass spectrometry. The method comprises four steps of sample pretreatment, thermal cracking-gas chromatography mass spectrometry measurement, qualitative analysis and quantitative analysis, wherein the steps are specifically are as follows: extracting polyvinyl chloride in a plastic sample through tetrahydrofuran oscillation, cracking the polyvinyl chloride through a thermal cracking device, analyzing the crackate through a gas chromatography mass spectrometry instrument, analyzing the characteristic crackate of polyvinyl chloride to determine the nature so as to judge whether the sample contains polyvinyl chloride, and finally, quantifying the characteristic crackate through a benzene external standard method so as to measure the polyvinyl chloride content in the sample. The method provided by the invention can be used for accurately quantifying the polyvinyl chloride content in plastic, the method is simple in pretreatment, few in sampling, fast in test and good in specificity, and the detection limit of the method is 1000 mg / kg.

Description

[technical field] [0001] The invention relates to the technical field of polyvinyl chloride content determination, in particular to a method for determining polyvinyl chloride content in plastics by pyrolysis-gas chromatography mass spectrometry. [Background technique] [0002] Polyvinyl chloride is a widely used polymer material, widely used in electronic appliances, light industry, textile, home furnishing and other fields. Since polyvinyl chloride will produce dioxin and other highly toxic substances during the combustion process, its application is increasingly limited. The European Union stipulates that polyvinyl chloride cannot be used for materials that are in direct contact with food. Many large electronic and electrical manufacturers have begun to promote PVC. The measures of FREE reduce the application of polyvinyl chloride in products. At present, there are many qualitative studies on polyvinyl chloride in domestic and foreign literature, such as Fourier transfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 申屠献忠刘平年冯颖區颖欣苏景成
Owner SGS CSTC STANDARDS TECH SERVICES (SHANGHAI) CO LTD
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