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Maximum heavy metal levels in various types of samples
| Type of site | Cd | Cr | Cu | Hg | Ni | Pb | Zn |
|---|---|---|---|---|---|---|---|
| mg kg−1 | |||||||
| Soil | 7.7 | 306.1 | 60.4 | 0.541 | 27.6 | 191.2 | 476.0 |
| Soil (under swing) | 8.8 | 448.1 | 56.0 | 0.272 | 27.5 | 168.2 | 421.0 |
| Sand box | 7.7 | 566.6 | 28.2 | 0.074 | 31.7 | 65.5 | 107.9 |
