The vapor pressure for chloroform is 159 mm Hg at 20 °C, and it has a log octanol/water partition coefficient (log K ow) of 1.97. (1) Conversion Factors: To convert concentrations in air (at 25°C) from ppm to mg/m 3: mg/m 3 = (ppm) × (molecular weight of the compound)/(24.45). For chloroform: 1 ppm = 4.88 mg/m 3
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