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Physical & Chemical properties

Partition coefficient

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Endpoint:
partition coefficient
Type of information:
calculation (if not (Q)SAR)
Remarks:
Calculation based on the logKow measurements for single carbon chain lengths
Adequacy of study:
supporting study
Study period:
2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Calculation based on the of the study performed according to standardized method
Qualifier:
no guideline followed
GLP compliance:
no
Type of method:
calculation method (fragments)
Key result
Type:
log Pow
Partition coefficient:
1.5
Temp.:
25 °C
pH:
>= 5 - <= 6

The logKow for the registration substance was calculated using the values in the table below:

 C-chain length  measured logKow (see report Paulson, 2010, nr. 10AC0090)  Typical concentration in the registration substance (%)
 C12  1.26  73
 C14  2.16  23
 C16  2.6  2
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-01-25 -> 2010-01-31
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Determination run according to standardized method, no GLP compliance.
Reason / purpose:
assessment report
Qualifier:
according to
Guideline:
OECD Guideline 123 (Partition Coefficient (1-Octanol / Water), Slow-Stirring Method)
Deviations:
yes
Remarks:
Some adjustments have been done. The concentration of the surfactant is below the CMC value, pH has been adjusted to 5-6
GLP compliance:
no
Type of method:
shake-flask method to: flask method
Remarks:
slow stir
Partition coefficient type:
octanol-water
Type:
log Pow
Partition coefficient:
0.7
Temp.:
25 °C
pH:
>= 5 - <= 6

The measurements were made at a pH of 5-6 and at an initial concentration of 507 µg/L in the water phase (about 10% of the critical micelle

concentration (CMC) in water) and at 25°C. The partition coefficient value was determined from the weighed average of the concentrations of the main components in the product listed in the table below.

 

Substance

Log POW

Bis (2 -hydroxyethyl) coco alkylamine

0.7

with the following results of its components:

Bis (2-hydroxyethyl) octyl amine

-1.38

Bis (2-hydroxyethyl) decyl amine

 0.2

Bis (2-hydroxyethyl) dodecyl amine

 1.26

Bis (2-hydroxyethyl) tetradecyl amine

  

2.16

 Bis (2-hydroxyethyl) hexadecyl amine

 > 2.6

 Bis (2-hydroxyethyl) octadecylene amine

 >2.1

 Bis (2-hydroxyethyl) octadecyl amine

 >2.1

Conclusions:
The partition coefficient of the test substance is 0.7 (log Pow).
Executive summary:

The partition coefficient of the test substance is 0.7 (log Pow).

Description of key information

The partition coefficient is 1.5 (log Pow).

Key value for chemical safety assessment

Log Kow (Log Pow):
1.5
at the temperature of:
25 °C

Additional information

For the estimation of the partition coefficient read across has been made from a substance with approximately the same carbon chain distribution but containg small amounts of both shorter and longer carbon chain lengths. Since there are measured values for each single carcon chain length the final value was adjusted by recalculating it by using the typical chain lentgh distribution of the registration substance.