Table 1.
Values of variables for the assessment of health risks by heavy metal exposure.
| Variable | Value |
|---|---|
| Csoil (mg kg−1): heavy metal concentration in soil | Table 2 |
| ABS (unitless): dermal absorption factor | 0.03 for As and 0.001 for other metals |
| AF (mg cm−2): soil to skin adherence factor | 0.07 for Adults, 0.2 for Children |
| AT (d): averaging time | ED × 365 for non-carcinogenic and 70 × 365 for carcinogenic |
| BW (kg): body weight | 70 for Adults, 15 for Children |
| ED (yr): exposure duration | 30 for Adults, 6 for Children |
| EF (d yr−1): exposure frequency | 350 for residential |
| ET (h d−1): exposure time | 24 for residential |
| RfD (mg kg−1 d−1): chronic reference dose | Supplementary Table 1 |
| RI (mg d−1): ingestion rate | 100 for Adults, 200 for Children |
| PEF (m3 kg−1): soil-to-air particle emission factor | 1.36 × 109 |
| SA (cm2 event−1): skin surface area available per event of heavy metal exposure | 5700 for Adults, 2800 for Children |
| SF (mg kg−1 d−1): carcinogenicity slope factor | Supplementary Table 2 |