State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, School of Marine Sciences, Ningbo University, Ningbo 315211, PR China; College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, PR China.
State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, School of Marine Sciences, Ningbo University, Ningbo 315211, PR China; School of Marine Sciences, Ningbo University, Ningbo 315211, PR China.
Sci Total Environ. 2021 May 20;770:144705. doi: 10.1016/j.scitotenv.2020.144705. Epub 2021 Jan 19.
The pollution characteristics, spatiotemporal variation, sediment-water partitioning, and potential ecological risk assessment of phthalate esters (PAEs) in the sediment-seawater system of the Hangzhou Bay (HZB) in summer and autumn were researched. The sum of the concentrations of the 10 PAEs in seawater ranges from 7305 ng/L to 22,861 ng/L in summer and from 8100 ng/L to 33,329 ng/L in autumn, with mean values of 15,567 ± 4390 and 17,884 ± 6850 ng/L, respectively. The Σ in the sediments are between 118 and 5888 μg/kg and 145 and 4746 μg/kg in summer and autumn, respectively. The level of PAEs in seawater varies with the seasons, but it is relatively stable in the sediments. Di(2-ethylhexyl) phthalate (DEHP), di-n-butyl phthalate (DnBP), and diisobutyl phthalate (DiBP) are the predominant PAE congeners in the HZB. The DnBP and DiBP concentrations in seawater are greater than the DEHP concentration, which is the opposite in the sediments. The sediment-seawater equilibrium distribution study indicates that the PAEs with medium molecular weights, such as DiBP, butyl benzyl phthalate, and DnBP, are near dynamic equilibrium in the sediment-seawater system; PAEs with high molecular weights (e.g., di-n-octyl phthalate and DEHP) tend to transfer from water to the sediments; and PAEs with low molecular weights (e.g., dimethyl phthalate, diethyl phthalate, and diamyl phthalate) tend to spread to seawater. The risk assessment results in seawater indicate that DEHP and DiBP might pose high potential risks to sensitive organisms, and DnBP might exhibit medium ecological risks. In the sediment, DiBP might display a high potential risk to fish, and the potential risk of DEHP is high in several sites.
研究了杭州湾（HZB）夏季和秋季海水-沉积物系统中邻苯二甲酸酯（PAEs）的污染特征、时空变化、固-液分配及潜在生态风险。海水中 10 种 PAEs 的浓度总和在夏季为 7305ng/L 至 22861ng/L，秋季为 8100ng/L 至 33329ng/L，平均值分别为 15567±4390ng/L 和 17884±6850ng/L。沉积物中的 Σ 值在夏季和秋季分别为 118μg/kg 至 5888μg/kg 和 145μg/kg 至 4746μg/kg。海水中的 PAEs 水平随季节变化，但在沉积物中相对稳定。二（2-乙基己基）邻苯二甲酸酯（DEHP）、邻苯二甲酸二正丁酯（DnBP）和邻苯二甲酸二异丁酯（DiBP）是 HZB 中主要的 PAE 同系物。海水中的 DnBP 和 DiBP 浓度大于 DEHP 浓度，而沉积物中的情况则相反。沉积物-海水平衡分配研究表明，DiBP、丁基苄基邻苯二甲酸酯和 DnBP 等中等分子量的 PAEs 在沉积物-海水系统中接近动态平衡；高分子量的 PAEs（如邻苯二甲酸二正辛酯和 DEHP）往往从水中转移到沉积物中；低分子量的 PAEs（如邻苯二甲酸二甲酯、邻苯二甲酸二乙酯和邻苯二甲酸二戊酯）则倾向于扩散到海水中。海水中的风险评估结果表明，DEHP 和 DiBP 可能对敏感生物构成高潜在风险，DnBP 可能表现出中等生态风险。在沉积物中，DiBP 可能对鱼类表现出高潜在风险，而 DEHP 在几个地点的潜在风险很高。
