CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
Ecotoxicol Environ Saf. 2017 Sep;143:296-306. doi: 10.1016/j.ecoenv.2017.05.036. Epub 2017 May 27.
Heavy metal contamination is an essential indicator of environmental health. In this work, one sediment core was used for the analysis of the speciation of heavy metals (Cr, Mn, Ni, Cu, Zn, As, Cd, and Pb) in Jiaozhou Bay sediments with different grain sizes. The bioavailability, sources and ecological risk of heavy metals were also assessed on a centennial timescale. Heavy metals were enriched in grain sizes of < 63µm and were predominantly present in residual phases. Moreover, the mobility sequence based on the sum of the first three phases (for grain sizes of < 63µm) was Mn > Pb > Cd > Zn > Cu >Ni > Cr > As. Enrichment factors (EF) indicated that heavy metals in Jiaozhou Bay presented from no enrichment to minor enrichment. The potential ecological risk index (RI) indicated that Jiaozhou Bay had been suffering from a low ecological risk and presented an increasing trend since 1940s owing to the increase of anthropogenic activities. The source analysis indicated that natural sources were primary sources of heavy metals in Jiaozhou Bay and anthropogenic sources of heavy metals presented an increasing trend since 1940s. The principal component analysis (PCA) indicated that Cr, Mn, Ni, Cu and Pb were primarily derived from natural sources and that Zn and Cd were influenced by shipbuilding industry. Mn, Cu, Zn and Pb may originate from both natural and anthropogenic sources. As may be influenced by agricultural activities. Moreover, heavy metals in sediments of Jiaozhou Bay were clearly influenced by atmospheric deposition and river input.
重金属污染是环境健康的重要指标。本研究采用沉积物柱状样，分析了胶州湾不同粒径沉积物中重金属（Cr、Mn、Ni、Cu、Zn、As、Cd 和 Pb）的形态分布。同时，还评估了重金属在百年时间尺度上的生物可利用性、来源和生态风险。重金属在粒径 < 63μm 的沉积物中富集，主要以残渣态存在。此外，基于前三个相（粒径 < 63μm）之和的重金属迁移顺序为 Mn > Pb > Cd > Zn > Cu > Ni > Cr > As。富集因子（EF）表明，胶州湾重金属处于无明显富集至轻微富集状态。潜在生态风险指数（RI）表明，胶州湾自 20 世纪 40 年代以来一直处于低生态风险状态，且由于人为活动的增加而呈现上升趋势。来源分析表明，自然源是胶州湾重金属的主要来源，人为源重金属自 20 世纪 40 年代以来呈现上升趋势。主成分分析（PCA）表明，Cr、Mn、Ni、Cu 和 Pb 主要来源于自然源，Zn 和 Cd 受造船业影响。Mn、Cu、Zn 和 Pb 可能来源于自然和人为源。As 可能受农业活动影响。此外，胶州湾沉积物中的重金属明显受到大气沉降和河流输入的影响。
