State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Sci Total Environ. 2020 Apr 20;714:136539. doi: 10.1016/j.scitotenv.2020.136539. Epub 2020 Jan 9.
The Jiaozhou Bay is a semi-enclosed bay located in the middle of the Yellow Sea. Effluents from wastewater treatment plants have been carried into the bay, which has significantly increased the deposition of mercury. The spatial distributions of total mercury (THg) and methylmercury (MeHg) in dissolved state, in suspended matters of seawater and surface sediments at 26 locations inside the Jiaozhou Bay and five surrounding rivers in April 2018 were examined. The contents of THg and MeHg found along the eastern coast were higher than those found along the western coast, which indicated the impact of human activities (river input) on the Jiaozhou Bay. The partition coefficient (LogKd) was used to express the distribution relationships of THg and MeHg in suspended matters and dissolved state, and it was concluded that suspended matter was the main reservoir of mercury in Jiaozhou Bay seawater. The correlations between contents and physicochemical properties of seawater showed that THg and MeHg concentrations in seawater decreased with increasing salinity and pH. The effects of the mean grain diameter (MGD) and sediment organic matter (SOM) on the THg and MeHg in surface sediments were also discussed. Principal component analysis (PCA) was used to obtain the factors determining the methylation proportion in the surface sediments, indicating that the combination of human activities and natural processes affected the degree of methylation in the sediments. The spatial distribution of THg, MeHg and MeHg% was suggested to be disturbed by the interaction of natural processes and human activities (river input) by the correlation analysis of the corresponding pollutant concentrations among seawater and. Although the concentrations of THg and MeHg in seawater and sediments of the Jiaozhou Bay did not exceed the Chinese regulatory standards, the pollution levels of THg and MeHg were comparable to those in other bays in the world.
胶州湾是位于黄海中部的一个半封闭海湾。污水处理厂的废水已被带入该湾，这导致汞的沉积显著增加。2018 年 4 月，在胶州湾内部的 26 个地点和五个周边河流中，对海水中溶解态、悬浮物质和表层沉积物中总汞（THg）和甲基汞（MeHg）的空间分布进行了研究。发现东海岸的 THg 和 MeHg 含量高于西海岸，这表明人类活动（河流输入）对胶州湾产生了影响。分配系数（LogKd）用于表示 THg 和 MeHg 在悬浮物质和溶解态中的分布关系，结果表明悬浮物质是胶州湾海水中汞的主要储存库。THg 和 MeHg 与海水理化性质之间的相关性表明，海水中的 THg 和 MeHg 浓度随盐度和 pH 值的增加而降低。还讨论了海水平均粒径（MGD）和沉积物有机质（SOM）对表层沉积物中 THg 和 MeHg 的影响。主成分分析（PCA）用于获得决定表层沉积物中甲基化比例的因素，表明人类活动和自然过程的结合影响了沉积物的甲基化程度。通过对海水中相应污染物浓度的相关分析，建议通过自然过程和人类活动（河流输入）的相互作用来干扰 THg、MeHg 和 MeHg%的空间分布。尽管胶州湾海水中的 THg 和 MeHg 浓度以及沉积物中的浓度未超过中国的监管标准，但与世界其他海湾相比，THg 和 MeHg 的污染水平相当。
