Separating flotation device and method for micro plastics in environment soil and sediment samples

Abstract

The invention belongs to the field of pretreatment study of environmental pollutants and relates to a separating flotation device and method for micro plastics, in particular to separating flotation of micro plastic particles in the environment soil and sediment samples. The device comprises a separation reactor and a filter, and the micro plastic particles in the soil and sediment samples are subjected to separating flotation with aeration and overflow methods. The device is simple, simple and convenient to operate, low in time consumption and efficient, and defects of tedious operation and high time consumption of a traditional micro plastic separating flotation method are overcome. Besides, a separating flotation solution is efficient, economical and recyclable, and environmental pollution is reduced while cost is saved.

Description

technical field [0001] The invention belongs to the research field of pretreatment of environmental pollutants, and relates to a separation and flotation device and method for microplastics, in particular to the separation and flotation of microplastic particles in environmental soil and sediment samples. Background technique [0002] The term microplastics was first proposed by Thompson in the United Kingdom in 2004, when it was used to describe plastic particles smaller than 50 microns (Thompson, R. C. et al., Lost at Sea: Where is All the Plastic Science, 2004, 304, 838.). In 2009, at the International Symposium on the Emergence, Impact and Fate of Plastic Marine Litter, Arthur proposed that "microplastics" should include all particles smaller than 5 mm. So far, there is no clear definition of the size of "microplastics". Most people generally agree that they are plastic particles with a particle size of less than 5 mm, but from an intuitive point of view, the definition ...

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Problems solved by technology

Before 2012, the flotation of microplastics in environmental samples mostly used traditional manual sieving and flotation methods (Hidalgo-Ruz, V. et al., Microplastics in the Marine Environment: A Review of the Methods Used for Identification and Quantification. Environmental Science &Technology, 2012, 3060-3075.), some slightly improved microplastic flotation methods have appeared in recent years, such as the "two-step method" proposed by Nuelle in Germany to extract microplastic particles in sediment samples (Nuelle, M. etc., A New Analytical Approach for Monitoring Microplastics in Marine Sediments.Environmental Pollution, 2013,161-169.), etc., but these methods have disadvantages such as cumbersome operation and long time-consuming

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