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Reference dose for trace metals.
| Heavy metal | Reference dose (RfD) |
REFERENCE | |
|---|---|---|---|
| Inhalation (mg/m3) | Oral (mg/kg/ day) | ||
| Chromium | 1.00E-4 | 3.00E-3 | EPA |
| Manganese | 5.00E-5 | 1.40E-1 | EPA |
| Copper | 1.43E-1 ± 2.25E-2 | 4.00E-2 | RAIS |
| Nickel | 9.00E-5 | 2.00E-2 | EPA |
| Cobalt | ND by EPA | 3.00E-2 | RTP |
| Arsenic | 4.3E-6 | 3.00E-4 | EPA |
| Cadmium | 1.00E-5 | 1.00E-3 | EPA/ATSDR |
| Lead | ND by EPA | 3.5E-3 | ND by EPA |
*ND = Not Determined. RTP (see ref [31]).
