Naphthalene

CAS RN: 91-20-3

Volatilization

The Henry's Law constant for naphthalene is 4.4X10-4 atm-cu m/mole(1). This Henry's Law constant indicates that naphthalene is expected to volatilize from water surfaces(2). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(2) is estimated as 6 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(2) is estimated as 5 days(SRC). In laboratory experiments conducted at room temperature, the volatilization half-life of naphthalene was shown to range from 0.17 hours (depth of water 7.2 cm) to 11.55 hours (depth of water 8.5 cm)(3). Naphthalene's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). The estimated volatilization half-life for naphthalene from soil is 1.1 days, and 14 days when incorporated at a depth of 1 cm and 10 cm, respectively(4).
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