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Environmental fate & pathways

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DMSO Log Koc is estimated as 0.64, using a log Kow of -1.35 and a regression-derived equation. This estimated Koc value suggests that DMSO is expected to have very high mobility in soil.Nevertheless, DMSO could adsorb chemically or physically on minerals contained in clay. It can be assumed that this weak adsorption would be due to DMSO polarity.

Koc = 0.15 is the value retained for PNEC calculations when equilibrium partitioning method is required. This Koc is obtained from Gerstl' equation (1990) as recommended by the technical guidance document for deriving PNECs.

Volatilization from soil

The Henry's Law constant for DMSO indicates that DMSO is expected to be essentially non volatile from moist soil.DMSO is expected to slowly volatilize from dry soil surfaces based upon a vapor pressure 0.56 hPa.

Volatilization from water

DMSO is not expected to volatilize from water. Its concentration would increase in time as water evaporates. The rate of volatilization will be controlled by the chemical's slow diffusion through air. The observation that the concentration of DMSO in marine air is about a hundredth that of dimethyl sulfide suggests that little or no DMSO is volatilizing from the sea surface.