Characteristics of the spatial and temporal distributions of selected dissolved heavy metals (Cu, Zn, Pb, Hg and Cd) in Bohai Bay, north China was investigated. Water samples from 22 sites were collected and analyzed for the selected metals with atomic absorption spectrometry from the year of 1996 to 2005. Relatively high concentrations of Cu, Zn, Pb and Hg were detected, with maximum concentrations in the 10-year period of 16.30, 422.00, 40.40, 0.23 og/L respectively. The concentrations of Cd in all samples were quite low, with maximum level of 0.89 og/L. The spatial distribution of dissolved Cu, Zn and Pb was analogous, where their average concentrations generally descended from the coastline to the central areas of the bay. Differently, for Hg and Cd, relatively high concentrations occurred not only in inshore but also in offshore areas. Measured data of heavy metals were compared with sea water quality standard of China (SWQSC). Cd concentrations in all samples were below SWQSC Grade-I. The percentages of Cu, Zn, Pb, and Hg at Grade-III levels in Bohai Bay were 2.67%, 30.00%, 30.43% and 0.36%, respectively, suggesting the severe contamination of Zn and Pb in this area. Terrestrial inputs via different rivers and sewages may be the important source for the heavy metals contamination.
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机译：研究了中国北方渤海湾地区某些溶解性重金属（铜，锌，铅，汞和镉）的时空分布特征。收集了22个站点的水样，并从1996年至2005年用原子吸收光谱法分析了所选择的金属。检测到相对较高的Cu，Zn，Pb和Hg浓度，十年中的最高浓度为16.30。 ，422.00、40.40、0.23 og / L。所有样品中的Cd浓度都非常低，最大含量为0.89 og / L。溶解的铜，锌和铅的空间分布是相似的，它们的平均浓度通常从海岸线下降到海湾的中心区域。不同的是，对于汞和镉，不仅在沿海地区而且在海上地区都出现了相对较高的浓度。将重金属的测量数据与中国海水质量标准（SWQSC）进行了比较。所有样品中的镉浓度均低于SWQSC一级。渤海湾三级铜，锌，铅和汞的百分比分别为2.67％，30.00％，30.43％和0.36％，表明该地区锌和铅的严重污染。来自不同河流和污水的地面投入可能是重金属污染的重要来源。
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