The Henry's Law constant for m-cymene is estimated as 7.15X10-3 atm-cu m/mole(SRC) derived from its vapor pressure, 1.72 mm Hg(1), and water solubility, 42.5 mg/L(2). This Henry's Law constant indicates that m-cymene is expected to volatilize rapidly 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 3.5 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)(3) is estimated as 4.6 days(SRC). m-Cymene's estimated Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). The potential for volatilization of m-cymene from dry soil surfaces may exist based upon its vapor pressure(1).
Literature: (1) Daubert TE, Danner RP; Physical and Thermodynamic Properties of Pure Chemicals Data Compilation Washington, DC: Taylor and Francis (1989) (2) Lun R et al; J Chem Eng Data 42: 951-53 (1997) (3) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990)
Using a structure estimation method based on molecular connectivity indices(1), the Koc of m-cymene can be estimated to be 1120(SRC). According to a classification scheme(2), this estimated Koc value suggests that m-cymene is expected to have low mobility in soil.
Literature: (1) US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Jan, 2011. Available from, as of Nov 6, 2013: http://www.epa.gov/oppt/exposure/pubs/episuitedl.htm (2) Swann RL et al; Res Rev 85: 17-28 (1983)