Table 2. Soil Environmental Quality Standards of China (GB15618–1995) and the content of exogenous Cd (mg.kg−1).
| pH | <6.5 | 6.5∼7.5 | >7.5 |
| Grade Two Standard | 0.3 | 0.3 | 0.6 |
| Low Cd | 0.3 | 0.3 | 0.6 |
| High Cd | 0.6 | 0.6 | 1.0 |
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