Paraquat

CAS RN: 4685-14-7

Volatilization

The Henry's Law constant for paraquat is estimated as <3.0X10-14 atm-cu m/mole(SRC) derived from its vapor pressure, <7.5X10-8 mm Hg(1), and water solubility, 6.2X10+5 mg/L(1). This Henry's Law constant indicates that paraquat is expected to be essentially nonvolatile from water and moist soil surfaces(2). In closed photodegradation tests using aqueous paraquat dichloride solutions over a 32-day period, no paraquat volatiles were detected(3). Paraquat is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).
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