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Method for measuring contents of PC, PP, PS and PE micro-plastics in soil by pyrolysis gas chromatography

A technology for cracking gas chromatography and microplastics, which is used in measurement devices, material separation, and analysis of materials.

Active Publication Date: 2022-01-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressurized extraction method requires the use of a special extraction device, which is costly

Method used

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  • Method for measuring contents of PC, PP, PS and PE micro-plastics in soil by pyrolysis gas chromatography
  • Method for measuring contents of PC, PP, PS and PE micro-plastics in soil by pyrolysis gas chromatography
  • Method for measuring contents of PC, PP, PS and PE micro-plastics in soil by pyrolysis gas chromatography

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The selection of embodiment 1 extraction time

[0040] The chromatographic responses of the characteristic peaks of PC, PP, PS and PE under the extraction time of 5, 10, 20 and 30 min were investigated respectively. The results showed that the optimal extraction time of the four MPs was inconsistent, and 20 min was selected as the optimal extraction time under comprehensive consideration.

Embodiment 2

[0041] Embodiment 2 methodological investigation

[0042] 1. Instruments and reagents

[0043] Gas chromatograph (SHMADZU GC-2010Plus), cracker (Frontier PY-2020D), gas chromatography-mass spectrometry instrument (SHMADZU GCMS-QP2010 SE); PC and soil mixture, PP and soil mixture, PS and soil mixture and PE Mix with soil.

[0044] 2. Experimental method

[0045] (1) Take a blank soil sample to remove large particles of impurities such as residual plants, place it in a dry place at 100°C for 3 hours to remove moisture, grind, sieve, and set aside;

[0046] (2) Preparation of mixed standard soil samples: use soil dilution method to prepare mixed standard soil samples with PE of 2000 μg / g, PC, PP and PS of 500 μg / g, and use soil dilution method to gradually dilute to PE mass concentration of 1000 μg / g, 400μg / g, 200μg / g, 100μg / g, 80μg / g, 40μg / g, 20μg / g, 10μg / g, 4μg / g, 2μg / g; the mass concentration of PC, PP and PS is 250μg / g , 100μg / g, 50μg / g, 25μg / g, 20μg / g, 10μg / g, 5μg / g, 2....

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Abstract

The invention provides a method for determining the content of PC, PP, PS and PE micro-plastics in soil by pyrolysis gas chromatography. Herein, four micro-plastics in soil can be qualitatively and quantitatively determined at the same time through derivatization and double-click pyrolysis technologies, and the quantitation limit is relatively low. According to the method, the loss of the sample in the density separation step can be avoided, the method has no requirements on the size, color and density of the micro-plastics, and the uncertainty caused by personal errors when the micro-plastics are manually selected is also avoided; besides, the extraction device is simple, only heating reflux is needed, and a special pressurizing device is not needed. The method has good reproducibility and accuracy, and the method for analyzing the micro-plastics in the soil by using the thermal cracking technology is perfected.

Description

technical field [0001] The invention relates to a cracking-gas chromatography analysis method (Py-GC) for determining the content of PC, PP, PS and PE microplastics in soil. Background technique [0002] Microplastics (Microplastic, MP) refers to plastics with a diameter of less than 5mm. Common types of MP are: polycarbonate (PC), polypropylene (PP), polystyrene (PS), polyethylene (PE), polyparaphenylene Ethylene glycol diformate (PET), ethylene-vinyl acetate copolymer (EVA), polymethyl methacrylate (PMMA). The sources of MP in soil mainly include: wastewater irrigation, garbage landfill, atmospheric deposition and the use of agricultural mulch. [0003] MP is both a source of organic pollution and a carrier of pollutants. In recent years, the pollution and ecological risks of MP have attracted global attention, but there is no unified qualitative and quantitative method for MP. The methods for the determination of MP in soil mainly include thermal analysis (thermogravime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8679G01N2030/062G01N2030/067
Inventor 黄忠平张敬坤刘会君
Owner ZHEJIANG UNIV OF TECH