海河流域沉积物重金属形态分布特征及生态风险评估

李生清

Speciation and distribution of heavy metals in sediments in Haihe River Basin and their effects on ecological risk assessment

LI Sheng-Qing

表3 重金属生态风险评估标准等级划分

Table 3 Classification of heavy metal ecological risk assessment standards

风险评估等级 潜在生态风险评估指数 污染程度 Z <5 无污染 Ⅰ 10~20 极轻度污染 Ⅱ 20~40 轻度污染 Ⅲ 40~80 中度污染 Ⅳ 80~160 强污染 Ⅴ 160~320 极强污染 Ⅵ ≥320 严重污染