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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:
From November 20 to December 07, 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. No deviation affected the quality of the study. The substance is considered to be adequately characterised with its purity. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
UK GLP Compliance Programme (inspected on August 21, 2007/ signed on October 15, 2007)
Type of method:
HPLC method
Partition coefficient type:
octanol-water
Analytical method:
high-performance liquid chromatography
Key result
Type:
log Pow
Partition coefficient:
1.95
Temp.:
30 °C
pH:
7.2
Details on results:
Partition coefficient of sample:
Mean log10Pow: 1.95
Partition coefficient: 88.5

Preliminary estimate:

Approximate solubility in n-octanol: < 296 g/L

Approximate solubility in water: > 2.02 g/L

Approximate Pow: < 146

Log10Pow: < 2.17

Definitive test:

Regression parameters: log k = 0.432 x log Pow - 0.725 (r = 0.983)

Table 4.7/1: Partition coefficient of sample

Injection

Retention Time

(mins)

Capacity Factor (k)

Log10k

Log10Pow

1

5.393

1.31

0.117

1.95

2

5.390

1.31

0.116

1.95

Conclusions:
The substance has low potential to bioaccumulate in the environment, according to CLP classification criteria for aquatic chronic toxicity (log Kow <4).
Executive summary:

The partition coefficient of the test substance was measured under GLP according to the OECD guideline 117, HPLC method. The system was calibrated with 6 reference substances, and the result for the sample was interpolated from the linear regression.

Partition coefficient (log10Pow) = 1.95 at 30°C.

Description of key information

The substance has low potential for bioaccumulation, according to Regulation (EC) No.1272/2008 (CLP) criteria for classification in aquatic chronic toxicity hazard class (log Kow <4).

It should also be of no concern for PBT assessment.

Key value for chemical safety assessment

Log Kow (Log Pow):
1.95
at the temperature of:
30 °C

Additional information

A fully reliable experimental study, conducted according to a recognized EC method (HPLC) and under GLP, is available. It is considered as a key study. The result is retained as key data.