Table 1.
Exposure factors and parameters for risk assessment
| Exposure factors | Symbol | Units | Residential | Data source |
|---|---|---|---|---|
| Exposure duration | ED | Years | 30 | EPA (1997a) |
| Exposure frequency | EF | Days/year | 350 | EPA (1997a) |
| Average time | AT | |||
| Non-carcinogens | ATnc | Years | 30 | EPA (1997a) |
| Body weight | BW | kg | 62.8 | KMOE (2007) |
| Ingestion rate | IR | |||
| Soil | IRs | kg/day | 0.00002 | EPA (2011) |
| Rice (farmer) | IRr-f | kg/day | 0.296 | KOSTAT (2013) |
| Rice (non-farmer) | IRr-nf | kg/day | 0.175 | KOSTAT (2013) |
| Napa cabbage | IRn | kg/day | 0.0607 | KMOHW (2013) |
| Onion | IRo | kg/day | 0.0273 | KMOHW (2013) |
| Drinking water | IRw | L/day | 1.5 | KMOE (2007) |
| Exposed skin surface area | SA | |||
| Skin surface area (forearms, hands) | SAs | m2 | 1.96 | EPA (1997a) |
| Soil-skin adherence factor | AF | kg/m2/day | 0.0007 | |
| Absorption factor for skin | ABSs | – | 0.01 | EPA (1997a) |