海州湾南部表层沉积物重金属空间分布、污染和风险评价

Spatial distribution,pollution and ecological risk assessment of heavy metals in surface sediments of the Southern Haizhou Bay

为了解海州湾南部海域表层沉积物重金属空间分布特征、污染程度和生态风险水平,采集11个站位表层沉积物,测定有机碳、铜、铅、锌、镉、铬、汞和砷的含量。利用背景值计算污染负荷指数(PLI)、地累积指数(I geo)和潜在生态风险指数(RI)。结果表明:重金属总体呈现由岸向海、由南向北减小的趋势;PLI和I geo表明研究区总体为中等污染,主要污染因子为镉;RI表明研究区处于低风险,主要风险因子为镉。

In order to understand the spatial distribution characteristics,pollution degree and ecological risk level of heavy metals in surface sediments of the Southern Haizhou Bay,surface sediments from 11 stations were collected and the contents of organic carbon,copper,lead,zinc,cadmium,chromium,hydrargyrum and arsenic were determined.The pollution load index(PLI),geo accumulation index(I geo)and potential ecological risk index(RI)calculated by the background value were used to detect the heavy metal pollution degree and ecological risk level.The results showed that the heavy metals decreased from shore to sea and from south to north.PLI and I geo indicated that the study area was generally moderately polluted,and cadmium was the main pollution factor.RI indicated that the study area was at a low ecological risk level,and cadmium was the main risk factor.