知识与财富的链接
2011年对天津近岸海域表层沉积物中重金属及砷含量进行了调查,采用Muller地累积指数法和Hakanson潜在生态风险指数法(RI),对该区表层沉积物中重金属及砷的生态风险进行了评价。结果表明:天津近岸表层沉积物中重金属及As含量总体处于较低水平,33.3%的站位Cu含量超过第一类海洋沉积物质量标准;单因子指数法和地累积指数法计算污染程度排序一致,均为Cd>Pb>Cu>Zn>Cr>Hg>As;潜在生态风险评价显示重金属对天津近岸海域生态风险构成的风险程度排序为Cd>Hg>Pb>Cu>As>Cr>Zn,天津近岸海域沉积物重金属的潜在生态风险属于低度生态风险。
The concentrations of heavy metals and As in the surface sediment samples from Tianjin offshore area were surveyed in 2011, and the ecological risk of heavy metals and As was evaluated using Muller geo-accumulative index and Hakanson potential ecological risk index (RI). The results showed that the concentrations of heavy metals and As in surface sediment of Tianjin offshore area are low. The concentration of Cu in 33.3% stations exceeded the standards of first class of Marine sediment quality. The degree of pollution calculated by single factor index was Cd>Pb>Cu>Zn>Cr>Hg>As, which was consistent with geo-accumulation index. The accumulation coefficients of heavy metals and the ecological risk assessment showed that the potential ecological risk in Tianjin offshore area was Cd>Hg>Pb> Cu>As>Cr>Zn, suggesting that the area had slight potential ecological risk.
