College of Life Science and Technology, Guangxi University, Nanning, 530004, China; Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
School of Marine Sciences, Guangxi University, Nanning, 530004, China; College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004, China.
Chemosphere. 2019 Oct;232:1-8. doi: 10.1016/j.chemosphere.2019.05.199. Epub 2019 May 23.
Eight fish species were sampled from a coastal coral reef ecosystem near Weizhou Island, South China Sea, to investigate the composition profiles and bioaccumulation of organochlorines (OCs). The total concentrations of 18 organochlorine pesticides (OCPs) and 22 polychlorinated biphenyls (PCBs) were found to be 26.5-452 ng/g lw and 0.87-19.8 ng/g lw, respectively. The contaminant distribution pattern indicated that agrochemical sources were more important than industrial sources, and that historical residues remain the primary source of OCs in Weizhou Island. Bioaccumulation factors (BAFs) indicated that dichlorodiphenyltrichloroethanes was bioaccumulating with log BAFs ranging from 3.53 to 5.21. Some congeners diverged from the general trend predicted by the logarithm octanol-water partition coefficient (log K); this was mainly attributable to differences in the bioaccumulation potentials of these congeners in the studied samples. Trophic magnification factors demonstrated that aldrin, endrin, and dieldrin undergo significant trophic dilution, while the other six OC compounds undergo trophic magnification in the food chain. The presence of OCP congeners was also probably affected by their metabolism in fish tissues. The estimated daily intakes of OCPs via fish consumption by residents ranged from 0.05 to 5.45 ng/kg body weight/day, which is below the acceptable daily intake recommended by the FAO/WHO.
从南海涠洲岛附近的沿海珊瑚礁生态系统中采集了 8 种鱼类，以研究有机氯（OCs）的组成分布和生物积累。发现 18 种有机氯农药（OCPs）和 22 种多氯联苯（PCBs）的总浓度分别为 26.5-452ng/g lw 和 0.87-19.8ng/g lw。污染物分布模式表明，农药来源比工业来源更为重要，历史残留仍然是 OCs 在涠洲岛的主要来源。生物积累因子（BAFs）表明，滴滴涕具有生物积累性，其对数生物积累因子（log BAFs）范围为 3.53-5.21。一些同系物偏离了由辛醇-水分配系数（log K）对数预测的一般趋势；这主要归因于研究样品中这些同系物的生物积累潜力存在差异。营养放大因子表明，艾氏剂、狄氏剂和异狄氏剂在食物链中经历显著的营养稀释，而其他六种 OC 化合物则经历营养放大。OCP 同系物的存在也可能受到其在鱼组织中的代谢影响。居民通过食用鱼类摄入 OCPs 的估计每日摄入量在 0.05-5.45ng/kg 体重/天之间，低于粮农组织/世卫组织推荐的每日可接受摄入量。
