Propargyl Alcohol

CAS RN:107-19-7

Environmental Fate

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 14(SRC), determined from a log Kow of -0.38(2) and a regression-derived equation(3), indicates that propargyl alcohol is expected to have very high mobility in soil(SRC). Volatilization of propargyl alcohol from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 1.1X10-6 atm-cu m/mole(SRC), derived from its extrapolated vapor pressure, 15.6 mm Hg(4), and water solubility, 1X10+6 mg/L (miscible)(5). Volatilization from dry soils is expected(SRC), given the extrapolated vapor pressure(4). The half-life of propargyl alcohol in an alkaline sandy silt loam (61.5% sand, 31.1% silt, 7.4% clay, pH 7.8, 3.25% organic carbon) from Texas was 12.6 days and 13 days from an acidic sandy loam (68% sand, 23.4% silt, 8.6% clay, pH 4.8, 0.94% organic carbon) from Mississippi(6).

AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 14(SRC), determined from a log Kow of -0.38(2) and a regression-derived equation(3), indicates that propargyl alcohol is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 1.1X10-6 atm-cu m/mole(SRC), derived from its extrapolated vapor pressure, 15.6 mm Hg(4), and water solubility, 1X10+6 mg/L (miscible) (5). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 16 and 176 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 3(SRC), from its log Kow(2) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Biodegradation in aerobic water may occur for propargyl alcohol based on biodegradation half-lives of 12.6 and 13 days in two soils(8). In addition, propargyl alcohol achieved 95% of its theoretical BOD in a screening study using an activated sludge inoculum(9), suggesting this compound will degrade under aerobic condictions.

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), propargyl alcohol, which has an extrapolated vapor pressure of 15.6 mm Hg at 25 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase propargyl alcohol is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 37 hours(SRC), calculated from its rate constant of 1X10-11 cu cm/molecule-sec at 25 deg C (SRC) that was derived using a structure estimation method(3). Propargyl alcohol is also degraded in the atmosphere by reaction with ozone; however, the half-life of this reaction is long compared to the reaction with hydroxyl radicals and is not environmentally relevant(SRC). The half-life for this reaction in air is estimated as 380 days from its theoretical rate constant of 3X10-20 cu cm/molecule-sec(SRC), that was derived using a structure estimation method(3). Propargyl alcohol does not contain chromophores that absorb at wavelengths >290 nm and therefore is not expected to/may be susceptible to direct photolysis by sunlight(4).

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