长江口有机磷酸酯环境多介质传输分配行为

Multi-media distribution and partitioning behavior of organophosphate esters in the Yangtze River Estuary

揭示了有机磷酸酯(organophosphate esters,OPEs)在长江口表层水、底部水和沉积物中的多介质赋存特征、空间分布与垂向传输规律以及典型水环境相间分配行为,并探讨了关键影响因素及环境意义.OPEs已广泛分布于长江口环境中,水样中峰值主要分布在人类活动强度高的区域,同时,河口水文特征也提升了入海口样本中的OPEs含量.基于风险商推断出的中、高生态风险主要由磷酸三(2-乙基己基)酯和双酚A双二苯基磷酸酯导致.每年经长江口径流和泥沙向东海汇入的OPEs总量分别约为150 t和290 kg,已与诸多主流污染物的通量相当甚至更高.结果展现了OPEs在我国城市河口环境中的高残留量以及对于生态系统的潜在风险.

This research investigated multi-media occurrences of organophosphate esters(OPEs)in sediments,surface and bottom water sampled from the Yangtze River Estuary,and elucidated their spatiovertical trends and partitioning behavior across typical aquatic interfaces.Additionally,we determined the key factors affecting the estuarine fate of OPEs and the associated environmental implications.Various OPEs were ubiquitous in the study region,and the peak water-borne residues were often found adjacent to the sites with more intense anthropogenic activities.Moreover,the estuarine hydrodynamic features also increased the OPE burden in water and sediments at the outlet of the Yangtze River.The moderate-tohigh ecological risks suggested by risk quotients were mainly generated by tris(2-ethylhexyl)phosphate and bisphenol A-bis(diphenyl)phosphate.The annual fluxes via the water flow and sediment deposition of the Yangtze River towards the East China Sea were predicted to be approximately 150 t and 290 kg,respectively,rivalling or exceeding those reported for many well-studied organic contaminants.Our results highlight the prevalence and abundance of OPEs in a representative urbanized estuary in China and the substantial ecological risks they pose to aquatic ecosystems.