Method for separating microplastics in environmental soil or sediment based on combination of flotation and centrifugation

A technology for microplastics and sediments, applied in chemical instruments and methods, centrifuges, wet separation, etc., can solve the problems of cumbersome and time-consuming extraction of microplastics, poor reliability, low efficiency, etc., to improve the enrichment and concentration capacity, The effect of low cost and little environmental pollution
CN110715835AInactive Publication Date: 2020-01-21HENAN UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HENAN UNIVERSITY
Publication Date
2020-01-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of solid waste treatment, and particularly relates to a method for separating microplastics in environmental soil or sediment based on a combination of flotation and centrifugation. The method includes the following steps that sampling is conducted, specifically, soil or a sediment sample is dried and divided into specifications of less than 1 mm, 1-5 mm, and greater than 5 mm; pre-digestion is conducted, specifically, a digestion solution is added, and still standing for digestion is conducted after stirring is conducted; the flotation is conducted, specifically, a flotation solution is added, and still standing is conducted after stirring is conducted; overflowing is conducted, specifically, and the flotation solution is continually accessed to make upper layer liquid overflow; centrifugation is conducted, specifically, and the overflow liquid is centrifuged at 4000r / min; suction filtration is conducted, specifically, supernatant is subjected to the suction filtration; re-digestion is conducted, specifically, a filter membrane is taken out, the digestion solution is added for continual digestion, and then drying is conducted; and finally, microscopic analysis is performed, and abundance is calculated. According to the method for separating the microplastics in the environmental soil or the sediment based on the combination of the flotation and the centrifugation, the enrichment and concentration abilities are improved, and the disadvantages of tedious operation, unclean separation, and low recovery rate of a traditional microplastic separation and flotation method are overcome.
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Description

technical field

[0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method for separating microplastics in environmental soil or sediment based on the combination of flotation and centrifugation. Background technique

[0002] The advent of plastic has changed our way of life. Because this material can be used in a large temperature range, has low thermal conductivity, high strength-to-weight ratio, biological inertness, durability and other advantages, it has been widely used all over the world, from From household products to personal hygiene products, from clothing, packaging to building materials, plastic products appear in all aspects of human life. It is precisely because of their widespread use that since they were put into mass production in the 1950s, the world's plastic production has shown The trend of exponential growth has risen from 5 million tons in the 1950s to 322 million tons in 2016.

[0003] While ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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