Ammonia

CAS RN: 7664-41-7

Volatilization

Ammonia is lost from water by volatilization(1). The Henry's Law constant for ammonia has been measured as 1.61X10-5 atm-cu m/mole(2). This Henry's Law constant indicates that ammonia is expected to volatilize from water surfaces(3). 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)(3) is estimated as 1.4 days(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(3) is estimated as 12 days(SRC). Ammonia's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Ammonia is a gas with a vapor pressure of 7500 mm Hg at 25 deg C and atmospheric pressure(4), and therefore, is expected to volatilize from dry soil surfaces(SRC).
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