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Method for rapidly extracting and analyzing micro-plastics in soil based on density separation method

A technology of density separation and microplastics, which is applied in the analysis of materials, material analysis by optical means, preparation of samples for testing, etc. And other issues

Pending Publication Date: 2021-07-06
ZHEJIANG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sieving and filtration methods and electrostatic separation methods have good extraction effects on microplastics in seawater and soil sediments. They can pre-concentrate and initially classify microplastics, and simplify the detection of microplastics in further analysis, but cannot Removal of organic matter and poor extraction of microplastics attached to cohesive soils
Density separation is a common separation and extraction method, but in some methods the density of the extraction solution is too small to extract large-density microplastics

Method used

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  • Method for rapidly extracting and analyzing micro-plastics in soil based on density separation method
  • Method for rapidly extracting and analyzing micro-plastics in soil based on density separation method
  • Method for rapidly extracting and analyzing micro-plastics in soil based on density separation method

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Embodiment 1

[0024] Example 1. Detection of microplastics in Hangzhou farmland

[0025] Refer to as figure 1 The flow chart shown is the rapid extraction and detection of microplastics in soil.

[0026] S1. Extraction of microplastics in soil:

[0027] Take 50g of the soil to be tested, dry it in an oven (drying temperature 60°C, drying time 48 hours), sieve out particles with a particle size above 5mm, and then add it to MgCl 2 In a saturated aqueous solution, the volume-to-mass ratio of the extract to the soil to be tested is 200ml:50g. After fully stirring for ten minutes, the microplastics float in the solution. After standing for 6 hours, the suspension and the soil are completely layered; then the suspension is poured out. , carry out suction filtration, place the filtered microplastics in 30% hydrogen peroxide at 60° C. for 48 hours until the solution is clear, and then dry.

[0028] S2. Analysis of microplastics in soil:

[0029] The dried microplastics were observed under a mi...

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Abstract

The invention discloses a method for rapidly extracting and analyzing micro-plastics in soil based on a density separation method, which specifically comprises the following steps of: S1, extracting micro-plastics in soil: taking to-be-detected soil, drying the to-be-detected soil, then screening out particles with larger particle sizes, then adding the soil into an extracting solution, fully stirring to enable the micro-plastics to suspend in the extracting solution, and standing to layer the suspension liquid and the soil; and pouring out the suspension liquid, filtering the suspension liquid, collecting a filter cake, digesting the filter cake, and drying to obtain micro-plastics; and S2, analyzing the micro-plastics in the soil: observing the dried micro-plastics under a microscope, and judging the shape and color of the micro-plastics; and analyzing the functional peak of the micro-plastics by using a Fourier infrared spectrometer, and qualitatively determining the type of the micro-plastics according to a spectrogram. The method disclosed by the invention is wide in application, for example, the method can be used for qualitative detection of micro-plastics in farmlands. Instruments and equipment required by the method are simple to operate and easy to observe, and the method is a simple, convenient and rapid analysis method and has important significance on environment and food safety work.

Description

technical field [0001] The invention relates to the technical field of extraction and analysis of microplastics in soil, in particular to a method for rapidly extracting and analyzing microplastics in soil based on a density separation method. Background technique [0002] The problem of microplastic pollution is currently attracting worldwide attention. Microplastics are generally defined as plastic pellets, microfibers, plastic particles, foamed plastics or films with a particle size of less than 5 mm. There are many kinds of microplastics, polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), ABS resin (ABS), nylon (PA), etc. are the most common types of microplastics Pollutants, accounting for more than 90% of the total amount of microplastic pollutants found. [0003] Microplastics come from a wide range of sources, including small plastic products in industrial production, plastic microbeads added to cosmetics and detergents, and plastic ...

Claims

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Application Information

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IPC IPC(8): G01N21/359G01N1/44
CPCG01N21/359G01N1/44G01N2021/3595
Inventor 周瑛柳一王萍亚吴益春赵巧灵
Owner ZHEJIANG UNIV OF TECH
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