摘要
全氟辛烷磺酸(PFOS)作为一种新污染物备受关注.文章利用CoZMo-POP2逸度模型分析了 1988-2022年长三角区域PFOS和其前体物(PreFOS)(N-乙基全氟辛基磺酰胺(N-EtFOSA)、N-甲基全氟辛基磺酰胺(N-MeFOSA)、N-乙基全氟辛基磺酰胺乙醇(N-EtFOSE)和N-甲基全氟辛基磺酰胺乙醇(N-MeFOSE))的环境行为.结果显示:1988-2022年研究区域PFOS、N-EtFOSA、N-MeFOSA、N-EtFOSE和N-MeFOSE的累计排放量分别约为26、2.5、0.16、7.8和5.9t.PFOS在土壤、淡水和沉积物中的模拟浓度与实测浓度残差在1个对数单位内,验证了模型的可靠性.敏感性分析表明:温度和分配系数是影响污染物浓度的关键参数.当环境系统达到平衡时,近海水体是PFOS主要的汇,占PFOS环境总量的79％;从淡水到河口到近海水体的迁移是PFOS在环境中的主要迁移过程,占PFOS总迁移量的53％;流向外部是PFOS最主要的输出途径.土壤是N-EtFOSA、N-MeFOSA、N-EtFOSE和N-MeFOSE最主要的储存库,各目标污染物分别约占其环境总量的99％、98％、91％和97％;降解反应是N-EtFOSA、N-MeFOSA、N-EtFOSE和N-MeFOSE的主要输出途径.该文探讨并明确了长江三角洲PFOS和PreFOS的迁移归趋,可为长三角的生态风险评价和污染控制提供一定的科学依据.
Abstract
Perfluorooctane sulfonate acid(PFOS)is of great concern as a new contaminant.In this study,CoZMo-POP 2 fugacity model was used to simulate and calculate emission,fate distribution,and transfer processes of PFOS,N-EtFOSA,N-MeFOSA,N-EtFOSE and N-MeFOSE in Yangtze River Delta during 1988-2022.The results showed that cumulative emissions of PFOS,N-EtFOSA,N-MeFOSA,N-EtFOSE and N-MeFOSE in the study area were about 26t,2.5 t,0.16t,7.8 t and 5.9 t,respectively.The model reliability was verified by fact that residuals of modeled and measured concentrations of PFOS in soil,freshwater,and sediment were within 1 log unit.According to the result of sensitivity analysis,temperature and partitioning coefficients were key parameters affecting pollutant concentrations.When environmental system reached equilibri-um,the largest sink of PFOS was coastal water,accounting for approximately 79％of total amount remaining in the system.The transfer from fresh water to estuarine water and estuarine water to coastal water were the main PFOS transfer routes between media,accounting for 53％of total transfer.Flow to the outside is most important output pathway for PFOS.The largest sink of N-EtFOSA,N-MeFOSA,N-EtFOSE and N-MeFOSE were soil,accounting for approximately 99％,98％,91％and 97％of total amount remaining in the system,respectively.Degradation was the main output pathway for N-EtFOSA,N-MeFOSA,N-EtFOSE and N-MeFOSE.This study simulated the transfer and fate of PFOS and PreFOS in the environmen-tal multimedia of Yangtze River Delta,which could provide a scientific basis for its pollution control and ecological risk assessment.
基金项目
国家自然科学基金项目(41977310)
嘉兴市公益性研究计划项目(2021AY10044)
维普
万方数据