Occurrence Characteristics of Microplastics in the Sedimentary Sequence in the Past Forty Years of Qixia Section of the Jiuxiang River in Nanjing City
Microplastic pollution is becoming one of the most serious threats to the earth's surficial environment.As an emerging global pollutant,it is increasingly concerned by the society,the public and the scientific community.Rivers are a critical path for the transmission of microplastics from terrestrial land to the ocean.Although microplastic pollution in urban rivers and lakes is becoming more serious,relevant research in different urban areas remain unclear.In this study,combined with 210Pb,a microplastics(size＞100 µm)abundance-time curve was established by using the sedimentary record of Qixia section in Jiuxiang River in Nanjing city.The results showed that the abundance of microplastics in the Jiuxiang River sediment column ranged from 367-2 033 items/kg.The morphology is mainly fiber,the color is mainly green and white,and the particle size is mainly 100-500 µm.The main types were polypropylene(40.20％),polyester(21.70％),polyethylene(20.90％)and rayon(10.30％).The abundance of microplastics increased from 1984 to 2020 on the whole,remained basically unchanged from 1984 to 1992,fluctuated greatly from 1992 to 2010,but showed an overall upward trend,and monotonically increased and exponentially increased from 2010 to 2020.This may be related to the discharge of domestic sewage and industrial wastewater during the rapid development of urbanization in the survey area.
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