广西茅尾海入海河口表层沉积物重金属分布及风险评价

阎琨, 庞国涛, 李伟, 毛方松

Assessing the distribution and ecological risks of heavy metals in surface sediments of the Maowei Sea estuary, Guangxi

YAN Kun, PANG Guo-Tao, LI Wei, MAO Fang-Song

表2 茅尾海入海河口沉积物重金属地累积指数评价结果

Table 2 Evaluation results of heavy metal accumulation index in sediments of Maowei Sea Estuary

Igeo值 级数 污染程度 比例/% As Cd Cr Cu Hg Pb Zn <0 0 无污染 84.7 84.7 53.8 76.9 76.9 92.3 76.9 0<I≤1 1 轻度污染 15.3 15.3 30.8 23.1 23.1 7.7 23.1 1<I≤2 2 偏中度污染 0 0 15.4 0 0 0 0 2<I≤3 3 中度污染 0 0 0 0 0 0 0 最大值 0.11 0.66 1.18 0.19 0.37 0.22 0.53 Igeo 最小值 -3.31 -3.20 -1.43 -1.97 -3.22 -2.15 -2.42 平均值 -1.20 -1.49 -0.02 -0.71 -1.45 -1.00 -0.92