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Environmental fate & pathways

Adsorption / desorption

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Reference
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 and its relevant degradation products decompose rapidly

Description of key information

The performance of a test for adsorption/desorption screening is scientifically unjustified.
REACh Regulation No. 1907/2006, Annex VIII, Sect. 9.3.1, Col. 2, states as follows:
“9.3.1 The study need not be conducted if:
- based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient), or
- the substance and its relevant degradation products decompose rapidly.”
A determination of the biodegradability of the test item was performed according to OECD 301D, respectively. The test item is evaluated as ready biodegradable. Thus, determination of adsorption of the test item is scientifically unjustified and not required under REACH.

Key value for chemical safety assessment

Koc at 20 °C:
4 413

Additional information

A waiver is used to adress the endpoint:

The performance of a test for adsorption/desorption screening is scientifically unjustified.

REACh Regulation No. 1907/2006, Annex VIII, Sect. 9.3.1, Col. 2, states as follows:

“9.3.1 The study need not be conducted if:

- based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient), or

- the substance and its relevant degradation products decompose rapidly.”

A determination of the biodegradability of the test item was performed according to OECD 301D, respectively. The test item is evaluated as ready biodegradable. Thus, determination of adsorption of the test item is scientifically unjustified and not required under REACH.

Further supporting QSAR calculations were available. The following logKOC values were determined which were representative for the components of the test item:

Monomer: 1.1279 (KOC=13.42 L/kg)

Dimer: 3.6448 (KOC=4413 L/kg)

MIBK: 1.8453 (KOC=70.03 L/kg)

As worst case the dimer KOC value of 4413 L/kg was chosen for this endpoint.

[LogKoc: 3.6448]