Magnesium octadecylbenzenesulphonate

Partition coefficient

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03 April 2019 to 29 May 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)

Qualifier:

according to guideline

Guideline:

EU Method A.8 (Partition Coefficient - Shake Flask Method)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7550 (Partition Coefficient, n-octanol / H2O, Shake Flask Method)

GLP compliance:

yes

Type of method:

estimation method (solubility ratio)

Partition coefficient type:

octanol-water

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Lot/batch No.of test material: E01255-297
- Expiration date of the lot/batch: 31 December 2022

Analytical method:

other: Calculation method used

Key result

Type:

log Pow

Partition coefficient:

> 6.6

Temp.:

20 °C

pH:

7.2

Details on results:

The n-octanol solubility of the test item was determined after the stirring period. The test solution was clear and no undissolved material was observed. It was concluded that the n-octanol solubility of the test item at 20 °C was >5.2 x 10^2 g/L.

The water solubility of the test item at 20 °C was 0.134 mg/L.

The estimation method was applied to calculate the partition coefficient (n-octanol/water) as the quotient of the n-octanol solubility and of the water solubility. The Pow value of the test item was calculated to be >3.87 x 10^6. It corresponds with a log Pow value of >6.6.

Conclusions:

The estimation method was applied to calculate the partition coefficient (n-octanol/water) as the quotient of the n-octanol solubility (>5.2 x 10^2 g/L at 20 °C) and of the water solubility (0.134 mg/L at 20 °C). The Pow value of the test item was calculated to be >3.87 x 10^6. It corresponds with a log Pow value of >6.6.

Executive summary:

The study was performed based on procedures in the OECD Guideline 107 (Partition Coefficient (n-octanol/water), Shake Flask Method); EU Method A.8 (Partition Coefficient - Shake Flask Method); EPA OPPTS 830.7550 (Partition Coefficient, n-octanol/H₂O, Shake Flask Method). The test item is a mixture of compounds and based on the composition of the test item, surface activity is expected and therefore the partition coefficient was estimated from the water solubility and the n-octanol solubility. The estimation method was applied to calculate the partition coefficient (n-octanol/water) as the quotient of the n-octanol solubility (>5.2 x 10² g/L at 20 °C) and of the water solubility (0.134 mg/L at 20 °C). The Pow value of the test item was calculated to be >3.87 x 10⁶. It corresponds with a log Pow value of >6.6.

Description of key information

The study was performed based on procedures in the OECD Guideline 107 (Partition Coefficient (n-octanol/water), Shake Flask Method); EU Method A.8 (Partition Coefficient - Shake Flask Method); EPA OPPTS 830.7550 (Partition Coefficient, n-octanol/H₂O, Shake Flask Method). The test item is a mixture of compounds and based on the composition of the test item, surface activity is expected and therefore the partition coefficient was estimated from the water solubility and the n-octanol solubility. The estimation method was applied to calculate the partition coefficient (n-octanol/water) as the quotient of the n-octanol solubility (>5.2 x 10²g/L at 20 °C) and of the water solubility (0.134 mg/L at 20 °C). The Pow value of the test item was calculated to be >3.87 x 10⁶. It corresponds with a log Pow value of >6.6.

Key value for chemical safety assessment

Log Kow (Log Pow):

6.6

at the temperature of:

20 °C