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Environmental fate & pathways

Henry's Law constant

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Description of key information

Volatilisation of oleic-acid based IQAC, DMS quaternised is negligible.

Key value for chemical safety assessment

Additional information

Henry's Law Constant of oleic-acid based IQAC, DMS quaternised was calculated using EPIWIN v3.20, HENRYWIN v3.10 (bond method). The calculation yielded a very low value (5.43 10E-16 atm m³/mole; 5.5 10E-11 Pa m³/mole at 25°C each). The estimation based on the calculated water solubility and vapour pressure (EPIWIN calculations) according to H=vp/ws gave a Henry's Law Constant of 9.8 10E-13 atm x m³/mole (9.9 10E-8 Pa m³/mole) at 25°C. The calculated Henry's Law Constants indicate that the substance can be regarded as non-volatile from aqueous solution. Due to missing information about the applicability of the calculation model in respect to the substance under investigation the results should be treated with care. This is supported the fact that oleic-acid based IQAC, DMS quaternised has an ionic structure and a relatively high molecular weight of 733 g/mol.