POLLUTION SITUATION AND RISK ASSESSMENT OF MICROPLASTICS IN AGRICULTURAL SOIL IN WUHAN
Soil serves as a significant sink for plastic waste and microplastics.Investigating the pollution status and ecological risks of microplastics in agricultural soil can provide fundamental data and theoretical support for the management of soil microplastic pollution.In this study,soil samples were collected from greenhouse vegetable fields in different regions of Wuhan.Microplastics in the soil were quantitatively and qualitatively analyzed using the Nile Red fluorescence staining method and Raman spectroscopy.The results revealed an average abundance of microplastics in the cultivated layer soil of vegetable fields in Wuhan to be(2938.9±1637.5)particles per kilogram of dry weight(n/kg dw),predominantly in the form of fibers and fragments.Polyethylene(PE)and polypropylene(PP)were identified as the main polymer types,exhibiting a significant positive correlation.Microplastics at different depths in the sampling areas showed similarities in morphology and types.The risk assessment using the pollution load index method indicated a risk level of Class Ⅰ for all sampled regions.However,the risk assessment using the risk index and potential risk index methods revealed higher risks at sampling points where polyvinyl chloride(PVC)was detected,suggesting the need for standardized models in the future to assess the ecological risks of microplastics.
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万方数据
