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Method for Determination of Nanoplastics Based on Cloud Point Extraction-Pyrolysis Gas Chromatography-Mass Spectrometry

A gas chromatography-mass spectrometry and thermal cracking technology, applied in the field of determination of nanoplastics based on cloud point extraction-thermal cracking gas chromatography-mass spectrometry, can solve the problems of insufficient reliability, time-consuming, laborious and so on

Active Publication Date: 2020-10-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is not only time-consuming and laborious, but also prone to errors in the actual operation process, and the reliability of the results is insufficient.
In addition, the spatial resolutions of FT-IR and Raman are 20 μm and 1 μm, respectively, which are not suitable for the analysis of nanoplastics

Method used

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  • Method for Determination of Nanoplastics Based on Cloud Point Extraction-Pyrolysis Gas Chromatography-Mass Spectrometry
  • Method for Determination of Nanoplastics Based on Cloud Point Extraction-Pyrolysis Gas Chromatography-Mass Spectrometry
  • Method for Determination of Nanoplastics Based on Cloud Point Extraction-Pyrolysis Gas Chromatography-Mass Spectrometry

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Embodiment 1

[0029] Optimize cloud point extraction conditions:

[0030] Such as Figure 2A As shown, the initial thermal decomposition temperatures of surfactants TX-45, TX-100 and TX-114 are about 180 °C, 260 °C and 210 °C, while as Figure 2B As shown, the initial thermal decomposition temperature of polystyrene (PS), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyethylene (PE) nanoplastics is 210 ° C ~ 260 ° C, thus, it can be TX-45 with a lower thermal decomposition temperature was selected as the cloud point extraction agent, and the subsequent heating temperature was determined to be 190°C, and the heating time was 3h, so that TX-45 could be removed before Py-GC / MS detection without affecting the detection of nanoplastics analyze.

[0031] In this embodiment, taking 60nm polystyrene nanoplastics as an example, select MgSO 4 Additional extraction conditions were optimized for ionic strength modifiers. For other extraction conditions such as surfactant concentrati...

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Abstract

Disclosed is a method for determining nanoplastics based on cloud point extraction-thermal cracking gas chromatography mass spectrometry. The method comprises the following steps of: performing cloudpoint extraction on a to-be-determined solution under optimized cloud point extraction conditions, achieving nearly 500-fold enrichment of trace amounts of nanoplastics in water, and maintaining original morphologies and particle sizes of the nanoplastics by using the method; and removing TX-45 in a surfactant phase by using a heating decomposition method after the enrichment by the cloud point extraction, and realizing composition identification and quality determination of the nanoplastics by using a Py-GC / MS method. The method is simple in operation steps and good in stability, the interference of the sample matrix is small, the enrichment factor is high, and the separation and determination of trace amount of nanoplastics in the actual water can be realized.

Description

technical field [0001] The invention belongs to the field of environmental analytical chemistry, and in particular relates to a method for measuring nanoplastics based on cloud point extraction-pyrolysis gas chromatography mass spectrometry (Py-GC / MS). Background technique [0002] Due to their excellent physical and chemical properties, plastics are widely used in industry, agriculture and daily life. During the mass production and use of plastic, it will inevitably enter the environment. Studies have shown that under the effects of solar radiation, mechanical wear and biodegradation, large plastic waste in the environment will gradually decompose, forming microplastics with a particle size of less than 5mm or even nanoplastics with a particle size of 1-999nm. In addition, some industrial products such as detergents, daily skin care products and industrial raw materials contain a large amount of micro-nano plastics, which can enter the environment through direct discharge....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 刘景富周小霞郝立腾
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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