南黄海海洋表层沉积物中重金属的分布特征及潜在生态风险评价.doc

MARINE ENVIRONMENTAL SCIENCE 2 0 1 1 年 1 0 月 October 2 0 1 1 南黄海海洋表层沉积物中重金属的分布特征 及潜在生态风险评价 佘运勇，王 剑，王艳华，王洪涛 ( 浙江省舟山海洋生态环境监测站，浙江 舟山 316000) 摘 要: 对南黄海海域表层沉积物中重金属含量进行了测定，分析了重金属元素的分布特征，采用地累积指数法和生态风 险指数法评价了沉积物中重金属的污染水平及其对环境的潜在生态危害程度。结果显示，Cu，Pb，Cd，Zn，Hg，As 的平均含 量分别为 17． 1 × 10 -6 ，19． 6 × 10 -6 ，0． 092 × 10 -6 ，77． 3 × 10 -6 ，0． 021 × 10 -6 ，6． 97 × 10 -6 。空间分布特征整体表现为重金属高值 区主要分布在南黄海中部及偏东北部区域。地累积指数评价结果显示 Hg、As 未出现污染，Pb、Zn 表现为轻度污染，Cu、Cd 主要表现为轻度污染并有少数测点达到偏中度污染。生态风险指数评价结果表明，南黄海表层沉积物中重金属元素的潜在 生态风险整体表现为轻微。Cu、Pb、Zn、Hg、As 的生态风险危害轻微，而 Cd 主要表现为中等生态危害等级并有少数测点达到 较强的生态危害等级。各种元素对区域内的潜在生态风险危害的大小顺序为: Cd ＞ Cu ＞ Hg ＞ Pb ＞ As ＞ Zn。 关键词: 南黄海; 表层沉积物; 重金属; 分布; 潜在生态风险; 评价 中图分类号:X826; X55 文献标识码: A 文章编号: 1007-6336( 2011) 05-0631-05 Distribution and potential ecological risk assessment on heavy metals in surface sediments of the South Yellow Sea SHE Yun-yong，WANG Jian，WANG Yan-hua，WANG Hong-tao ( Zhejiang Provincial Zhoushan Marine Ecological Environmental Monitoring Station，Zhoushan 316000，China) Abstract: The concentrations and distributions of heavy metals in the surface sediments of the South Yellow Sea were analyzed． The assessment of environmental quality in sediment was done with the geo-accumulation index and potential ecological risk index． The re- sults showed that the average concentrations of Cu，Pb，Cd，Zn，Hg and As were 17． 1 × 10 -6 ，19． 6 × 10 -6 ，0． 092 × 10 -6 ，77． 3 × 10 -6 ，0． 021 × 10 -6 ，6． 97 × 10 -6 ，respectively． The horizontal distributions of heavy metals showed that the high values were observed in the central and northeast of the survey area． The results of pollution degree assessment by the geo-accumulation index showed that Cu，Cd，Pb and Zn belonged to the light pollution degree mainly，while，Cu and Cd showed near to the moderate pollution degree at few monitoring stations． Hg and As were not found the pollution in the survey area． The results of potential ecological risk degree as- sessment showed that the pot-ential ecological risk degree was light in the surve