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EC number: 202-603-6
CAS number: 97-72-3
Hydrolysis studies show that isobutyric anhydride added to water rapidly
converts to isobutyric acid. Thererfore, isobutyric acid data is being
used by read across for all environmental fate and ecotox endpoints.
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).
Based on a calculated log Koc of
1.65 (Koc = 44.7) for the charged molecule, isobutyric acid is
expected to have a high mobility in soil (OXEA, 2010).
The results of Hemphill (1962) are not
suited to assess the adsorption of isobutyric acid to soils (sorbents
are pure clays).
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