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Method for quantitatively determining micro-plastic in water environment

A technology for quantitative determination and microplastics, which is applied in the field of environmental analytical chemistry, can solve problems such as easy to block holes and difficult to recycle, and achieve the effect of simple operation and high enrichment factor

Inactive Publication Date: 2020-06-09
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flotation method uses the density difference between the flotation liquid and the microplastics to separate, but it is easily interfered by substances of similar density in the water environment. This method requires further purification and separation; the filtration method uses the particle size of the microplastics to separate, but When the pore size of the filter membrane is small, it is easy to block the pores, and the microplastics will be closely attached to the filter membrane, making it difficult to recycle; electrostatic separation uses the electrostatic properties of microplastics to separate, but this method can only separate microplastics ≥ 63 μm, and Interference from other insulating substances cannot be avoided; magnetic solid phase separation uses silanized iron nanoparticles to separate microplastics through hydrophobic interactions with microplastics, this method is only suitable for clean samples, and is only effective for microplastics ≥ 15 μm
The above methods can only separate and enrich large-sized microplastics, and there are few reports on the separation and enrichment of microplastics ≤ 15 μm

Method used

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  • Method for quantitatively determining micro-plastic in water environment
  • Method for quantitatively determining micro-plastic in water environment
  • Method for quantitatively determining micro-plastic in water environment

Examples

Experimental program
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Embodiment 1

[0046] The method for the quantitative determination of microplastics in the water environment in this embodiment, such asfigure 1 shown, including the following steps:

[0047] (1) Filter 100mL of the water sample to be tested with a glass fiber membrane with a pore size of 1 μm, the microplastic particles are trapped and enriched on the glass fiber membrane, and the nanoplastic enters the filtrate;

[0048] (2) The glass fiber membrane enriched with microplastics was frozen with liquid nitrogen, quickly ground and transferred to a 1.5mL centrifuge tube, and deionized water was added to make the volume of the mixed solution 1mL. After thorough mixing, 50μL of the mixed solution (including Glass fiber film and microplastics) are transferred in the sample cup, carry out the mensuration of thermolysis-gas chromatography mass spectrometry (Py-GC / MS) after drying;

[0049] (3) Finally, data analysis was performed, and styrene (m / Z 104) and methyl methacrylate (m / Z 100) were analyz...

Embodiment 2

[0055] Quantitative determination of microplastics in different matrix water bodies.

[0056] First, pass 100mL of different matrix water samples through a glass fiber membrane with a pore size of 1 μm, the microplastic particles are trapped and enriched on the glass fiber membrane, the glass fiber membrane is transferred to a 1.5mL centrifuge tube, frozen in liquid nitrogen for 5min, and then the glass fiber Membrane, quickly ground to no obvious particles, transferred back to the centrifuge tube, added deionized water to ensure that the mixture was 1mL. After fully mixing by vortexing, take 50 μL of the mixed solution in the pyrolysis sample cup, dry it and measure it. Among them, PS microplastics were detected in 6 environmental water samples at a concentration of 1.2-9.2 μg / L, and PMMA microplastics were not detected. As shown in Table 1, it shows that this method can be used for the determination of microplastics at the concentration level of μg / L in environmental water....

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Abstract

The invention relates to a method for quantitatively determining micro-plastic in a water environment. The method comprises the following steps: filtering a constant-volume environment water sample byusing an enrichment membrane to entrap and enrich micro-plastic particles on the membrane, and enabling nano-plastic to enter filtrate; freezing and grinding the enrichment membrane enriched with themicro-plastic, adding distilled water to a constant volume, mixing, drying, and testing to finish the method for quantitatively determining the micro-plastic in the water environment. According to the present invention, the micro-plastic and the nano-plastic are separately determined for the first time, the micro-plastic (1 micrometer) separation and the quantitative determination at the microgramme / L level are achieved, and the method is successfully used in the actual water sample; and the method has the advantages of high sensitivity, high enrichment multiple, green and environment-friendly pretreatment process, and simple operation.

Description

technical field [0001] The invention relates to the field of environmental analytical chemistry, in particular to a method for quantitatively measuring microplastics in water environments. Background technique [0002] Plastic, due to its excellent physical and chemical properties, has been widely used in industrial production and daily life. During production, use and recycling, large amounts of plastic enter the environment. Plastic waste entering the environment will form 1 μm-5mm plastic particles (microplastics) under the action of solar radiation, mechanical wear and biodegradation. In addition, some detergents, daily skin care products, and industrial raw materials also contain a large amount of artificially added microplastics, which may also be released into the environment during preparation, transportation, and use. [0003] In recent years, as a new type of pollutant, microplastics have attracted the attention of scholars at home and abroad for their environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08G01N30/04G01N30/86
CPCG01N30/02G01N30/04G01N30/08G01N30/8675
Inventor 刘景富李庆存于素娟李鹏谭志强
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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