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Physical & Chemical properties

Partition coefficient

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Description of key information

For MDIPA-Esterquat C16-18 and C18 unsatd., in a weight of evidence approach, the log Pow was determined to be 4.43 at 20°C.

Key value for chemical safety assessment

Log Kow (Log Pow):
4.43
at the temperature of:
20 °C

Additional information

Instead of the partitioning between water and octanol, the partitioning of MDIPA-Esterquat C16-18 and C18 unsatd.  between water and organic carbon (log Koc) is used for log Pow derivation (detailed discussion see below).

The experimental Koc used for log Pow calculation is measured for 14C- MDIPA-Esterquat C16-18 and C18 unsatd.  in a GLP batch equilibrium study according to OECD guideline 106. For two sludges (high organic carbon content, mean 34%) and three soils (low organic carbon content, mean 1.4%) the partitioning constant is measured and the geometric mean calculated to be log Koc = 3.69.

With the “predominantly hydrophobic” log Koc – logKow relationship log Kow = 4.43.