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Physical & Chemical properties

Partition coefficient

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partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-11-19 to 2018-11-23
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 123 (Partition Coefficient (1-Octanol / Water), Slow-Stirring Method)
GLP compliance:
yes (incl. QA statement)
Type of method:
slow-stirring method
Partition coefficient type:
Analytical method:
high-performance liquid chromatography
log Pow
Partition coefficient:
25 °C

Validity criterion:

1. Repeatability: The mean log Pow values in the equilibration time for each replicate (test vessel) with four sub-replicates (samples) should fall within a range of ± 0.3 log.

2. Temperatures: 25 ± 1 °C


The validity criteria were fulfilled.

The determination of the partition coefficient (n-octanol/water) of the test substance was performed according to OECD 123 (2006). The partition coefficient Log Pow is: -2.934 ± 0.000 (25 ± 1 °C; mean pH 3.9).

Description of key information

The determination of the partition coefficient (n-octanol/water) was performed according to OECD 123 (2006). The partition coefficient of 2H-Isoindole-2 -ethanesulfonic acid, 1,3 -dihydro-1,3 -dioxo-, potassium salt (1:1) (TA-1) was determined to be Log Pow: -2.934 ± 0.000 (25 ± 1 °C; mean pH 3.9).

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
25 °C

Additional information