项目 | 二级标准 | ||
pH | <6.5 | 6.5~7.5 | >7.5 |
Cu | ≤50 | ≤100 | ≤100 |
As | ≤40 | ≤30 | ≤25 |
Pb | ≤250 | ≤300 | ≤350 |
Zn | ≤200 | ≤250 | ≤300 |
Cr | ≤150 | ≤200 | ≤250 |
Cd | ≤0.30 | ≤0.60 | ≤0.60 |
Hg | ≤0.30 | ≤0.50 | ≤1.0 |