Characteristics and risk assessment of microplastics in coal mining subsidence area with high groundwater level
In order to investigate the occurrence characteristics and environmental risks of microplastic pollution in coal mining subsidence areas with high groundwater levels,two typical coal mining subsidence areas,Chunshen Lake and Shungeng Wetland Park in Huainan City,Anhui Province,were selected as study areas.Surface water,sediment and soil samples from surrounding farmland were collected.The size,shape,color and abundance of microplastics were characterized by stereoscopic microscopy,scanning electron microscopy and infrared spectroscopy.The results of the study indicated that the majority of the samples consisted of fiber microplastics and film microplastics,primarily composed of polyethylene and polypropylene.These microplastics were predominantly yellow and transparent,with particle sizes smaller than 500 μm.In terms of abundance,surface water in the coal mining subsidence area ranged from 0.77 to 7.1 pcs/L,sediment contained microplastics ranging from 540 to 2800 pcs/kg,and surrounding farmland soil had microplastics ranging from 380 to 2380 pcs/kg.By applying the Pollution Load Index(PLI)model,the risk assessment for surface water and farmland soil was classified as level Ⅰ,indicating mild pollution.On the other hand,the risk assessment for microplastics in sediments was categorized as level Ⅱ,indicating moderate pollution.
microplasticscoal mining subsidence areahigh ground water levelsurface watersoilsedimentrisk assessment
万方数据
维普
