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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 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
Reason / purpose:
data waiving: supporting information
Reason / purpose:
data waiving: supporting information

Description of key information

The study need not to be conducted as the substance has a low potential for bioaccumulation (log Kow < 3) and is readily biodegradable
The calculated Koc for the charged molecule is 1.65 (OXEA, 2010).

Key value for chemical safety assessment

Koc at 20 °C:
44.7

Additional information

In accordance with column 2 of REACH Annex IX Nr 9.3.3, the study does not need to be conducted as the substance has a low potential for adsorption (log Kow < 3, see Sect. 4.7) and is readily biodegradable (see Sect. 5.2.1).

 

As additional information, the Koc of isobutyric acid was estimated to be 44.7 (log Koc = 1.65) using a method by Franco & Trapp (2008) for te estimation of the adsorption coefficient for the charged molecule (OXEA, 2010). The low Koc indicates high mobility in soil and low potential for absorption.

 

The results of Hemphill (1962) are not suited to assess the adsorption of isobutyric acid to soils. The sorbents are pure clay without carbon content and the publication has different weaknesses.

[LogKoc: 1.65]