| Abstrakt: |
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 26 t, 2.5 t, 0.16 t, 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 equilibrium, 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 soilaccounting 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 environmental multimedia of Yangtze River Delta, which could provide a scientific basis for its pollution control and ecological risk assessment. [ABSTRACT FROM AUTHOR] |
