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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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adsorption / desorption: screening
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter
adsorption / desorption
Type of information:
read-across from supporting substance (structural analogue or surrogate)
estimated by calculation
Adequacy of study:
supporting study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
Read Across to an analogue based on structural similarity. An analogue justification is attached to section 13 of the dataset.
Reason / purpose for cross-reference:
read-across: supporting information
no guideline required
Principles of method if other than guideline:
GLP compliance:
Type of method:
other: model calculation
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material:
n-hexanoic acid (CASRN 142-62-1)
Test temperature:
not applicable
Details on study design: HPLC method:
not applicable
Analytical monitoring:
not required
Details on sampling:
not applcable
Details on matrix:
not applicable
Details on test conditions:
not applicable
Computational methods:
U.S. EPA KOCWIN software v2.00 (February 2009).
41.3 dimensionless
25 °C
Remarks on result:
other: Estimated Koc, based on correlation with measured log Kow
log Koc
1.61 dimensionless
25 °C
Remarks on result:
other: Estimated value, based on correlation with measured log Kow
Details on results (HPLC method):
not applicable
Adsorption and desorption constants:
not applicable
Recovery of test material:
not applicable
Concentration of test substance at end of adsorption equilibration period:
not applicable
Concentration of test substance at end of desorption equilibration period:
not applicable
Transformation products:
not measured
Details on results (Batch equilibrium method):
not applicable
not applicable

The log Koc of 1.61 and the Koc of 41.3 were calculated for the uncharged molecule.

Description of key information

Waived:  Measured of adsorption/desorption is not required where low potential for adsorption is indicated from low value of log Kow.  A predicted value of log Koc = 1.61 is used for the chemical safety assessment.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

In accordance with column 2 of REACH annex VIII, adsorption/desorption screening does not need to be conducted if, based on the low octanol water partition coefficient, the substance can be expected to have a low potential for adsorption. The 2-ethylhexanoate component of the tin bis(2 -ethylhexanoate) salt has log Kow = 2.64 for its un-ionized species occurring at pH < 2.8. The log D for species occurring at pH 7 is estimated to be approximately 0.6. The estimated organic carbon-normalized adsorption coefficient (log Koc) is 1.61 (Koc = 41.3).