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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:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
according to guideline
other: Not listed
Principles of method if other than guideline:
The analyses of the concentrations of partitioned substances were made using a Cary Model 14 spectrophotometer.

For the determination, octanol saturated with distilled water and distilled water saturated with octanol were used. Usually 50-150 mL portions of octanol are used with 50-400 mL portions of water. The volume ratio of the two phases and the amount of sample were chosen so that, in most cases, the absorbance of a sample from the water layer after partitioning had a value between 0.2 and 0.9 using a 1 cm cell. Only the concentration of the sample in the water layer was determined, and that in the octanol was obtained by difference. The very small amount of octanal dissolved in the water was found to have no effect on the absorption curve at wavelengths higher than 220 mu.

The partition coefficient was calculated as P= C octanal/C water

Each determination was done at least in duplicate at two different volume ratios.
GLP compliance:
not specified
Type of method:
flask method
Partition coefficient type:
Analytical method:
photometric method
Key result
log Pow
Partition coefficient:
25 °C
Remarks on result:
other: Temperature and pressure not listed in reference

The partition coefficient was reported to be 1.96 (Log Pow) at 25 oC

The partition coefficient was reported to be 1.96 (Log Pow) at 25 oC
Executive summary:

The partition coefficient was reported to be 1.96 (Log Pow) at 25 oC

Description of key information

The partition coefficient was reported to be Log P = 1.96 at 25 °C.

Key value for chemical safety assessment

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

Additional information