【摘要】 选取龙华区河湖等11个水体,设计20个取样断面进行底泥采样,分析底泥样品重金属(锌、铜、镍、镉、铅、汞、砷、总铬)含量,采用潜在生态风险指数法和污染负荷指数法对其重金属污染状况进行评价。潜在生态风险指数评价结果表明,底泥中重金属镉污染较为严重,11个水体中有9个水体底泥样品中镉污染因子Cif>1,其余重金属中除锌表现出轻微污染外,均未发现污染情况,综合评价指标污染度Cd<8,潜在生态风险指数RI<150,表明测试底泥样品属于低风险水平;污染负荷指数法评价结果表明,底泥样品中锌、铜、镉和铅的最高污染系数最高,综合评价参数点位污染指数(PLI)和区域污染指数(PLIzone)均小于1,表明测试底泥样品整体无污染。更多还原

【Abstract】 Eleven rivers and lakes in Longhua district were selected and twenty sampling sections were designed to get sediment samples, and the contents of heavy metals(zinc, copper, nickel, cadmium, lead, mercury, arsenic, total chromium)in sediments were analyzed. The potential ecological risk index and pollution load index were used to evaluate the pollution status of heavy metals in sediment samples. Potential ecological risk index evaluation results showed that cadmium pollution in sediment was the most serious. Cadmium pollution factor Cif>1 was found in 9 sediment samples of 11 water bodies,and no pollution was found in other heavy metals except zinc. The pollution degree of comprehensive evaluation index Cd<8 and the potential ecological risk index RI<150, which indicates that the tested sediment samples belong to the low risk level. The results of pollution load index method show that the highest pollution coefficients of zinc, copper, cadmium which lead in sediment samples are the highest, and the comprehensive evaluation parameters of point pollution index(PLI) and regional pollution index(PLIzone) are all less than 1, indicated that the tested sediment samples are non-pollution.更多还原