[Characterization， Sources and Risk Assessment of Microplastic Pollution in Surface Water and Groundwater of the Hetao Irrigation Area].
摘要
<0.05）. Hierarchical clustering and Spearman's correlation coefficient methods were used to analyze the sources of microplastics in drained surface water and groundwater. The results showed that agricultural films were the main source of microplastics in water samples from the study area and that infiltration of microplastics carried by water flow from surface water was a potential source of microplastics in groundwater. The pollution load index （PLI） was used to evaluate the pollution level of microplastics， and the polymer hazard index （PHI） was used to evaluate the potential risk of microplastics in the water environment of the Hetao Irrigation Area. The PLI value indicated that the microplastics in the surface and groundwater in the study area were at a low level of contamination and that the increase in the amount of water discharged from the study area in the autumn irrigation period due to the flooding of the area diluted the microplastics in surface and groundwater. The PHI value indicated that PVC was the most potentially hazardous. The PHI value indicated that PVC had the highest potential risk. The results of this study can provide a research basis for the prevention， control， and management of microplastics in the Hetao Irrigation Area.