DISTRIBUTION PATTERN OF HEAVY METALS IN THE SURFACE SEDIMENTS AND ENVIRONMENT QUALITY EVALUATION FOR THE YANGTZE RIVER DELTAIC ECONOMIC ZONE
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摘要: 基于长三角经济区1 871个近海海域表层沉积物地球化学分析数据,结合相关地质资料,阐述了该区海域沉积物重金属含量及分布规律。结果表明,研究区表层沉积物重金属平均含量:As为8.12×10-6、Cd为101.53×10-9、Cr为74.79×10-6、Cu为19.33×10-6、Hg为34.87×10-9、Pb为22.31×10-6、Zn为67.13×10-6;空间分布上,元素含量从象山到乐清沿岸普遍偏高,而最低含量区见于江苏海岸;以综合指数法进行环境质量评价结果显示,重污染区分布在长江口河道内,轻污染分布在长江口附近海域、宁波-温州附近海域,清洁区主要分布在苏北海域。Abstract: This paper, based on the 1871 of geochemical data of surface sediments and other geological data, deals with the contents and distribution pattern of heavy metals in the Yangtze River Delta Economic Zone. The results show that, in the surface sediments of the study area, the average contents of As, Cd, Cr, Cu, Hg, Pb, Zn are 8.12×10-6, 101.53×10-9, 74.79×10-6, 19.33×10-6, 34.87×10-9, 22.31×10-6, and 67.13×10-6 respectively. The higher values of heavy metal elements appear in the area from the Xiangshan to the Yueqing Bay, while the lower values occur along the Jiangsu coast. The comprehensive index method was adopted for environmental quality assessment. It is revealed that the heavily polluted area is located along the channel of the Yangtze River, while slightly polluted area is near the Yangtze River Estuary and the area off Ningbo and Wenzhou. The area along the Jiangsu coat is rather clean.
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Keywords:
- Yangtze River Delta Economic Zone /
- sediment /
- heavy metals /
- environment assessment
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