| Media | Units | Adjustment |
| Water | mg/l (Standard) | x 1 |
| PPM | x 1 | |
| µg/l | ÷ 1,000 | |
| PPB | ÷ 1,000 | |
| Soil | mg/kg (Standard) | x 1 |
| µg/mg | x 1 | |
| µg/kg | ÷ 1,000 | |
| PPM | x 1 | |
| PPB | ÷ 1,000 | |
| Air | mg/m3 (Standard) | x 1 |
| µg/m3 | ÷ 1,000 | |
| PPM | x (molecular wt.) ÷ 24.45 | |
| PPB | x (molecular wt.) ÷ 24,450 | |
|
EXAMPLES:
Water: 17 µg/l = 17 ÷ 1,000 = 0.017 mg/l Soil: 1,350 µg/kg = 1,350 ÷ 1,000 = 1.35 mg/kg Air: 0.075 PPM (of benzene) = 0.075 x 78.11 ÷ 24.45 = 0.24 mg/m3 Where: the molecular weight of benzene = 78.11 g/mole Source of molecular weight information: http://risk.lsd.ornl.gov/cgi-bin/tox/TOX_select?select=nrad 1. Select "Chemical-Specific Factors" 2.Then "Molecular Weight (MW)" and the desired chemical(s)) |
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