Li Lei, Wang Yun-long, Jiang Mei, Yuan Qi, Shen Xin-qiang
Key and Open Laboratory of Marine and Estuarine Fisheries Resources and Ecology, Ministry of Agriculture, Chinese Academy of Fishery Sciences, East China Sea Fisheries Research Institute, Shanghai 200090, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2607-13.
Concentrations of six heavy metals were measured in the surface sediments from shellfish culture mudflats of Rudong Country, Jiangsu Province in 2010. The geo-accumulation index (Igeo) was employed to evaluate the pollution level of heavy metals and the results showed that the heavy metal contamination could be divided into three groups: no contamination (Igeo), as in the case of Cu, Cd, Hg; light to moderate contamination (0 < Igeo, < 1), as in the case of Pb, As; and moderate contamination (1 < Igeo, < 2), as in the case of Zn. The pollution level of heavy metals followed the order of Zn > As > Pb > Cd > Cu > Hg. The potential biological toxicity was analyzed using sediment quality guidelines (SQG), as the guideline values, Cd showed no potential biological toxicity, As showed occasional potential biological toxicity in all sampling stations, Cu, Pb, Zn, Hg showed potential biological toxicity in some sampling stations, whereas Zn was the only one showing frequent potential biological toxicity in some sampling stations. Sigma TUs revealed that only one of the sampling stations showed significant acute toxicity, whereas the others showed no acute toxicity. Analysis of heavy metal contamination source through principal component analysis (PCA) revealed that the contribution rates of the top two principal components were 37.56% and 33.71%, respectively, indicating that the two main sources of heavy metals were industrial waste water and pollution from transportation and shipping.
2010年对江苏省如东县贝类养殖滩涂表层沉积物中的6种重金属含量进行了测定。采用地累积指数（Igeo）评价重金属污染水平，结果表明，重金属污染可分为3组：无污染（Igeo），如Cu、Cd、Hg；轻度至中度污染（0＜Igeo＜1），如Pb、As；中度污染（1＜Igeo＜2），如Zn。重金属污染水平顺序为Zn＞As＞Pb＞Cd＞Cu＞Hg。采用沉积物质量基准（SQG）分析潜在生物毒性，以基准值衡量，Cd未显示潜在生物毒性，As在所有采样站偶尔显示潜在生物毒性，Cu、Pb、Zn、Hg在部分采样站显示潜在生物毒性，而Zn是在部分采样站频繁显示潜在生物毒性的唯一重金属。综合毒性单位（Sigma TUs）显示，仅1个采样站显示显著急性毒性，其他采样站未显示急性毒性。通过主成分分析（PCA）对重金属污染来源进行分析，结果显示前两个主成分的贡献率分别为37.56%和33.71%，表明重金属的两个主要来源是工业废水以及交通航运污染。
