The Henry's Law constant for methyl thiocyanate is estimated as 4.4X10-5 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This value indicates that methyl thiocyanate will volatilize from water surfaces(2,SRC). 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) is estimated as approximately 20 hours(2,SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec) is estimated as approximately 8.6 days(2,SRC). Methyl thiocyanate's Henry's Law constant(1,SRC) indicates that volatilization from moist soil surfaces is expected (SRC). The potential for volatilization of methyl thiocyanate from dry soil surfaces may exist(SRC) based on a measured vapor pressure of 12 mm Hg(4).
Literature: (1) Meylan WM, Howard PH; Environ Toxicol Chem 10: 1283-93 (1991) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (3) Lyman WJ; p 31 in Environmental Exposure From Chemicals Vol I, Neely WB, Blau GE(eds), Boca Raton, FL: CRC Press (1985) (4) Perry RH, Green D; Perry's Chemical Handbook, Physical and Chemical Data, NY, NY: McGraw Hill 6th ed (1984)
VERY SLIGHTLY SOL IN WATER; MISCIBLE WITH ALC, ETHER
Literature: Budavari, S. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 1996., p. 1045
Literature: #Soluble in carbon tetrachloride.
Literature: Lide, D.R. (ed.). CRC Handbook of Chemistry and Physics. 76th ed. Boca Raton, FL: CRC Press Inc., 1995-1996., p. 3-320
Using a structure estimation method based on molecular connectivity indices(1), the Koc for methyl thiocyanate can be estimated to be about 8.3(SRC). According to a recommended classification scheme(2), this estimated Koc value suggests that methyl thiocyanate is expected to have very high mobility in soil(SRC).
Literature: (1) Meylan WM et al; Environ Sci Technol 26: 1560-67 (1992) (2) Swann RL et al; Res Rev 85: 23 (1983)