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Environmental fate & pathways

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Adsorption on soil is not to be expected due to the high solubility of methanol as well as its low octanol-water partition coefficient. Adsorption coefficients between 0.13 and 1 were measured and calculated, respectively (Lokke 1984, BASF 2004). These coefficients indicate that methanol has a low adsorptive capacity on soils. A value of 0.461 Pa m³/mol for the Henry’s Law constant indicates that volatilization is not a significant removal process from the aquatic compartment Based on the Mackay Level I fugacity model the majority of Methanol is calculated to partition into the water phase. In addition a distribution calculation with the Mackay Level III fugacity model (BASF, 2003) was performed. This is a comprehensive multimedia model in which chemical emission, advection, reaction, intermedia transport and residence time or persistence are taken into account and therefore provides a more realistic representation of the fate of methanol in the environment. Using emission rates derived from total releases into water, air and soil (79658, 1531 and 658 tonnes, respectively) reported in the U.S. Toxics Release Inventory for 2001 the model predicts that the air is the target environmental compartment for methanol.