Table 3.
Reference values of health risk parameters due to heavy metals in urban soils.
| Heavy metals (mg/kg) | Reference doses (RfD) | Slope factors (SF) | ||||
|---|---|---|---|---|---|---|
| Ingestion | Inhalation | Dermal | Ingestion | Inhalation | Dermal | |
| As | 3.00E − 04 | 1.23E − 04 | 1.23E − 04 | 1.50E + 00 | 4.30E − 03 | 3.66E + 00 |
| Cr | 3.00E − 04 | 2.86E − 05 | 3.00E − 03 | 5.01E − 01 | 4.20E + 01 | 2.00E + 01 |
| Cu | 4.00E − 02 | 4.00E − 02 | 1.20E − 02 | – | – | – |
| Ni | 2.00E − 02 | 2.06E − 02 | 5.40E − 03 | 1.70E + 00 | – | 4.25E + 01 |
| Pb | 1.40E − 03 | 3.52E − 03 | 5.24E − 04 | 8.50E − 03 | – | – |
| Zn | 3.00E − 01 | 0.30 | 6.00E − 02 | – | – | – |