Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung 202, Taiwan, China.
J Environ Sci (China). 2010;22(8):1164-70. doi: 10.1016/s1001-0742(09)60233-3.
Mercury (Hg) concentrations in sediment samples collected from the inner and middle shelves of the East China Sea (ECS) were analyzed to evaluate Hg contamination levels and to calculate Hg sedimentation rates and total accumulation in the ECS. The range of Hg concentrations in surface sediments of the inner shelf was 26.5-47.6 ng/g, and that for the middle shelf was 4.1-13.9 ng/g. Hg concentrations correlated well with organic carbon contents but varied inversely with sediment grain size. Enrichment factors indicated that the whole inner shelf and a small portion of the middle shelf were slightly contaminated by Hg. Hg accumulation rates in the ECS ranged between 0.42-48.7 ng/(cm2 x yr), with higher values observed in the inner shelf. Total Hg accumulation in the calculated area (accounting for 80% of the ECS continental shelf area) ranged from 25 to 30 tons/yr; approximately 51% and 17% of the accumulated Hg mass was deposited in the Yangtze estuarine zone and the inner shelf, respectively.
采集了来自东海内架和中架的沉积物样本，分析了样本中的汞（Hg）浓度，以评估 Hg 的污染水平，并计算了东海的 Hg 沉积率和总积累量。内架表层沉积物中 Hg 的浓度范围为 26.5-47.6ng/g，中架的浓度范围为 4.1-13.9ng/g。Hg 浓度与有机碳含量密切相关，但与沉积物粒径呈反比。富集因子表明，整个内架和一小部分中架受到了 Hg 的轻微污染。东海的 Hg 积累率在 0.42-48.7ng/（cm2·yr）之间，内架的积累率较高。计算区域（占东海大陆架面积的 80%）的总 Hg 积累量在 25 到 30 吨/年之间；约 51%和 17%的积累 Hg 质量分别沉积在长江河口区和内架上。
