Registration Dossier
Registration Dossier
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EC number: 908-918-1 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The mixture is readily biodegradable according to OECD criteria.
Key value for chemical safety assessment
Additional information
The biodegradation of primary amyl acetate (mixture of 65% pentyl acetate, CAS 628-63-7, and 35% 2-methylbutyl acetate, CAS 624-41-9) was evaluated in detail in an OECD SIDS (2006). Primary amyl acetate and its major component, pentylacetate were considered to be readily biodegradable in aqueous environments. The composition of this mixture is very close to the present reaction mass consisting of pentyl acetate (ca. 66%), 2-methylbutyl acetate (ca. 33%) and the impurity isoamyl acetate (< 2%, CAS 123-92-2).
There is one GLP study that assesses the biodegradation of primary amyl acetate (mixture of 65% pentyl acetate, CAS 628-63-7, and 35% 2-methylbutyl acetate, CAS 624-41-9) according to OECD Guideline 301D. The 28-day aerobic test was conducted using domestic secondary wastewater effluent. Biodegradation of primary amyl acetate measured after 3, 5, 7, 10, 14, 17, 21, and 28 days was 31, 37, 45, 49, 51, 52, 53, and 57% of the theoretical oxygen demand (ThOD), respectively. These results indicate that primary amyl acetate is indeed biodegradable, and achieved 50% biodegradation after 10 days. The OECD criteria for the designation of “readily biodegradable” was not reached in this study (60% biodegradation within a 10-day window following onset of biodegradation) [Dow, 2004].
Primary Amyl Acetate was also evaluated for biodegradability according to American Public Health Association (APHA) Standard methodology, which is similar to OECD Guideline 301D. The 20-day biological oxygen demand (BOD) test was conducted using combined non-adapted domestic sewage treatment plant and industrial treatment seeds. Biodegradation of Primary Amyl Acetate measured after 5, 10, 15, and 20 days was 64, 76, 67, and 72% of the ThOD, respectively [Price et al. 1974a and 1974b].
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