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The main components DIPE and DSBE have a high Henry’s law constant
at 20 °C: the measured value for DIPE is 173 Pa m³/mol or 0.0709
(dimensionless). The estimated value for DSBE is 500 – 1000 Pa m³/mol
(Bond / Group Method) or 0.2 – 0.4 (dimensionless) using the HENRYWIN
(v3.20) routine of Episuite. According to the TGD IR & CSA R7a (2008,
p.191), chemicals with H values around 100 Pa m³/mol are considered to
TBA has a lower Henry’s law constant of 0.905 Pa m³/mol and SBA a
Henry’s law constant of 0.906 Pa m³/mol, similar to TBA. Both are still
expected to volatilise from surface water, but at a much slower rate.
Using the HPLC method, log KOC for the reaction mass was
determined in the range of 0.968 – 2.120. Strong binding to soil
particles is only expected for a log Pow > 5 or log Koc > 4 and
adsorption to sediment it not expected below a log Koc of 2.7 - 3 (ECHA,
TGD IR & CSA, 2008, R7 p.154). The components of the reaction mass are
thus not expected to strongly adsorb to soil or sediment.
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