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Environmental fate & pathways

Adsorption / desorption

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Endpoint:
adsorption / desorption
Remarks:
adsorption
Type of information:
(Q)SAR
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: validated QSAR model
Justification for type of information:
QSAR prediction: migrated from IUCLID 5.6
Qualifier:
according to
Guideline:
other: 2003 EU Technical Guidance Document on Risk Assessment Part III, Chapter 4, Section 4.3
Principles of method if other than guideline:
Log Koc was calculated based on an equation for predominantly hydrophobic substances developed by Sabljic A. & Güsten H. (1995) and an experimentally determined log Kow.
GLP compliance:
no
Type of method:
other: calculation
Media:
other: e.g. activated sludge, river water solids
Type:
log Koc
Value:
0.286
Type:
Koc
Value:
1.93
Endpoint:
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
the study does not need to be conducted because the substance and its relevant degradation products decompose rapidly

Description of key information

Key value for chemical safety assessment

Additional information

According to column 2 of EC 1907/2006 Annex VIII the testing on “Adsoption/Desorption” does not need to be conducted if the substance has a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient) or if the substance and its degradation products decompose rapidly. Based on log Kow ≤ 3 the potential for adsorption of alkyl ether sulfates is quite low. Hence, testing of the adsorption and desorption attributes of the category members is not necessary.

However, to estimate PNEC sediment by the equilibrium partitioning method data of the sorption behavior of alkyl ether sulfates are needed. Since measured sorption values are not available for the test substance the Koc was calculated using the QSAR for “Predominantly hydrophobics” from Sabljic & Gusten (1995).

Based on an experimental determined log Kow-value of 0.23 the calculated log Koc value for AES (C12-14, 1-2.5 EO) TEA (CAS 157627-94-6) is 0.286 (corresponding Koc = 1.93 L/kg).