项目 | 一级 | 二级 | 三级 | ||||
土壤pH值 | 自然背景 | <6.5 | 6.5~7.5 | >7.5 | >6.5 | ||
镉 | ≤0.20 | ≤0.30 | ≤0.30 | ≤0.60 | ≤1.0 | ||
汞 | ≤0.15 | ≤0.30 | ≤0.50 | ≤1.0 | ≤1.5 | ||
砷 | 水田 | ≤15 | ≤30 | ≤25 | ≤20 | ≤30 | |
旱地 | ≤15 | ≤40 | ≤30 | ≤25 | ≤40 | ||
铜 | 农田等 | ≤35 | ≤50 | ≤100 | ≤100 | ≤400 | |
果园 | — | ≤150 | ≤200 | ≤200 | ≤400 | ||
铅 | ≤35 | ≤250 | ≤300 | ≤350 | ≤500 | ||
铬 | 水田 | ≤90 | ≤250 | ≤300 | ≤350 | ≤400 | |
旱地 | ≤90 | ≤150 | ≤200 | ≤250 | ≤300 | ||
锌 | ≤100 | ≤200 | ≤250 | ≤300 | ≤500 | ||
镍 | ≤40 | ≤40 | ≤50 | ≤60 | ≤200 | ||
六六六 | ≤0.05 | ≤0.5 | ≤1.0 | ||||
滴滴涕 | ≤0.05 | ≤0.5 | ≤1.0 | ||||