项目元素 | As | Pb | Hg | Cd | Cr | Cu | Zn | |
指标≤ | 第一类 | 20.0 | 60.0 | 0.20 | 0.50 | 80.0 | 35.0 | 150.0 |
第二类 | 65.0 | 130.0 | 0.50 | 1.50 | 150.0 | 100.0 | 350.0 | |
第三类 | 93.0 | 250.0 | 1.00 | 5.00 | 270.0 | 200.0 | 600.0 | |
2009年均值 | 5.21 | 28.41 | / | / | 25.86 | 15.80 | 49.68 | |
2019年均值 | 4.94 | 25.49 | 0.016 | 0.086 | 65.79 | 15.18 | 58.03 | |
背景值 | 2 | 13.96 | 0.05 | 0.088 | / | 22.1 | 65.15 |