元素 | 空白/(μg/L) | 浓度1/(μg/L) | 浓度2/(μg/L) | 浓度3/(μg/L) | 浓度4/(μg/L) |
铅(Pb) | 0 | 2.5 | 5 | 10 | 20 |
镉(Cd) | 0 | 2.5 | 5 | 10 | 20 |
汞(Hg) | 0 | 2.5 | 5 | 10 | 20 |
砷(As) | 0 | 2.5 | 5 | 10 | 20 |