Registration Dossier

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
adsorption / desorption: screening
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Study period:
22June 2020
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
according to guideline
Guideline:
other: Technical Guidance Document on Risk Assessment, part 3
GLP compliance:
no
Remarks:
calculated value
Radiolabelling:
no
Key result
Type:
log Koc
Value:
9.58 dimensionless
Remarks on result:
other: For dimer 1
Key result
Type:
log Koc
Value:
9.9 dimensionless
Remarks on result:
other: for dimer 2

Soil-water partition coefficient (Koc and log Koc ) can be calculated using the equation from European Chemicals Bureau: Technical Guidance Document on Risk Assessment, Chapter 4, Table 4, page 26:

For predominantly hydrophobics: Log Koc (unitless) = 0.81 logKow + 0.10,

 

MTDID 18990 dimers have estimated log Kow at 25 °C of 11.7 and 12.1 for the dimer 1 and dimer 2, respectively. Based on the equation, the calculated log Koc (unitless) values are 9.58 and 9.90 for the dimer 1 and dimer 2, respectively. The Koc values are 3.78E+09 (unitless) and 7.96E+09 (unitless) for the dimer 1 and dimer 2, respectively.

Validity criteria fulfilled:
yes
Conclusions:
MTDID 18990 dimers have calculated log Koc (unitless) values of 9.58 and 9.90 for the representative dimer 1 and dimer 2, respectively, using the Technical Guidance equation for predominantly hydrophobic chemicals.
Executive summary:

Reaction products of fatty acids, C18-unsaturated, dimers and trimers with 3,3'-[oxybis(ethane-2,1-diyloxy)] dipropan-1-amine have multiple components. Approximately 62.7% of compounds are identified as dimers, and 31.5% of compounds are identified as trimers. Among the identified dimers and trimers, two dimers have ≥ 10% of composition and no trimers has ≥ 10% composition. Therefore, log Koc of the two dimers (dimer 1 and dimer 2) with ≥ 10% of composition are calculated using the Technical Guidance equation for predominantly hydrophobic chemicals.

Soil-water partition coefficient (Koc and log Koc) can be calculated using the equation from European Chemicals Bureau: Technical Guidance Document on Risk Assessment, Chapter 4, Table 4, page 26: for predominantly hydrophobics: Log Koc (unitless) = 0.81 logKow + 0.10.

MTDID 18990 dimers have estimated log Kow at 25 °C of 11.7 and 12.1 for the dimer 1 and dimer 2, respectively. Based on the equation, the calculated log Koc (unitless) values are 9.58 and 9.90 for the dimer 1 and dimer 2, respectively. The Koc values are 3.78E+09 (unitless) and 7.96E+09 (unitless) for the dimer 1 and dimer 2, respectively.

This study uses accepted calculation method according to technical guidance. Therefore, this study is considered reliable with restriction.

Description of key information

MTDID 18990 dimers have calculated log Koc (unitless) values of 9.58 and 9.90 for the two representative dimers.

Key value for chemical safety assessment

Koc at 20 °C:
3 780 000 000

Additional information

MTDID 18990 is a UVCB substance. Approximately 62.7% of the components are identified as dimers, and 31.5% of components are identified as trimers. Among the identified dimers and trimers, two dimers have ≥ 10% of composition and no trimers has ≥ 10% composition. Therefore, log Koc of the two dimers (dimer 1 and dimer 2) with ≥ 10% of composition are calculated using the Technical Guidance equation.


Soil-water partition coefficient (Koc and log Koc) was calculated using the equation for predominantly hydrophobic chemicals form European Chemicals Bureau: Technical Guidance Document on Risk Assessment, Chapter 4, Table 4, page 26. The calculated log Koc (unitless) values are 9.58 and 9.90 for the dimer 1 and dimer 2, respectively. The Koc values are 3.78E+09 (unitless) and 7.96E+09 (unitless) for the dimer 1 and dimer 2, respectively.

This study uses accepted calculation method according to technical guidance. Therefore, it is considered reliable with restriction (Klimsch 2) and a key study.