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Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2002-02-22 to 2002-04-16
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
preliminary estimation, duration and speed of centrifugation and purity of the test item are missing; temperature was not kept constant ±1°C
Qualifier:
according to guideline
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
Version / remarks:
, 1995
Deviations:
yes
Remarks:
, please refer to the field "Rationale for reliability incl. deficiencies" above
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient)
Version / remarks:
92/69/EEC (1992)
Deviations:
yes
Remarks:
, please refer to the field "Rationale for reliability incl. deficiencies" above
GLP compliance:
yes (incl. QA statement)
Remarks:
, signed 1999-05-25
Type of method:
shake-flask method to: flask method
Partition coefficient type:
octanol-water
Analytical method:
high-performance liquid chromatography
Type:
log Pow
Partition coefficient:
<= -2
Temp.:
20.6 °C
pH:
>= 6.29 - <= 6.43
Remarks on result:
other: a log Pow of -3.4103 was determined (n=6)
Details on results:
LOD: 0.04 mg/L
LOQ: 0.1 mg/L

No concentration of the test item in the n-octanol phase was determined. A concentration of 0.1 mg/L (LOQ) was assumed. With this assumption an log Pow of -3,4103 ± 2.57*10-3 was calculated.

The shake flask method is only suitable for a log Pow ≥ -2. Therefore a log Pow of < -2 for the test item was assumed.

The solubility of the test item in n-octanol is lower (minimum a hundred times) than in water.; even if the assumption (0.1 mg/L in n-octanol) is wrong, the Pow can not be >0. The Pow is important for the estimation of a bioaccumulation potential. A more exactly determination is therefore not necessary.

Conclusions:
The log Pow of the test item was estimated≤ -2 at 20.6 °C and pH 6.29 - 6.43.

Description of key information

The log Pow of the test item was estimated ≤ -2 at 20.6 °C and pH 6.29 - 6.43.

Key value for chemical safety assessment

Additional information