淡水环境沉积物中微塑料的密度分离方法研究

微塑料污染已广泛覆盖了全球海洋和淡水环境的表层水体、深层水体以及沉积物,沉积物中的泥沙和其他杂质颗粒会严重影响对沉积物中微塑料的实验分析.因此,将微塑料从沉积物中分离出来至关重要,而目前我国微塑料分离方法暂无统一的系统程序和检测标准.该研究在岷江成都段选取4个采样点采集沉积物样品,通过对比研究基于密度分离法的3种分离方...

Evaluation of The Density Separation Methods for Microplastics in Inland Freshwater Environment Sediments

It has been proved that microplastic pollution widely covers the surface water,deep water,and sediments in the marine and freshwater environments globally.It is very important to separate the microplastics from the sediments because the sand and other impurities will seriously affect the experimental analysis.At present,there is no unified system procedure and testing standard for separation methods of microplastics in China.In this paper,sediment samples were collected at four sampling points in Chengdu section of Minjiang River.Through the comparison of the three separation methods based on density separation,it was found that among the three methods of direct flotation method,volumetric flask flotation method and centrifugal method,the manual operations were less in centrifugal method because the centrifuge and other precision instruments were used.By using this method,the solution and sediments can be fully mixed and centrifuged,and the separation efficiency and accuracy were higher.This paper provides support for the selection of separation methods for microplastics in freshwater sediments.