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EC number: 208-760-7
CAS number: 540-88-5
in water, screening test: tertiary butyl acetate was partially degraded
by non-adapted sewage sludge over a period of 28 days in an OECD 301D
Closed Bottle test: at
the end of the 28 exposure period, 50% degradation was seen. Supporting
BOD/COD ratio data similarly indicated inherent, but not ready,
biodegradability. It is concluded that tertiary butyl acetate is
inherently biodegradable, not fulfulling specific ECHA criteria.
test substance t-Butyl acetate was shown not to significantly mineralise
in surface water in a pelagic water simulation test (conducted at 12°C),
with calculated half-life (DT50) values of 138 days (at 20 µg/L) and 252
days (at 100 µg/L).
experimental conduct of this study was challenging mainly due to the
high volatility of the test substance. Although the Henry’s Law constant
(83.2 Pa.m3/mol) was within the parameters considered acceptable for
slightly volatile substances in the OECD 309 guideline (<100 Pa.m3/mol),
under experimental conditions it was considered that the test substance
was too volatile for this guideline test. Despite the nature of the test
substance, the test design achieved acceptable mass balances and
considerable efforts were undertaken to identify potential degradates.
Therefore, it was considered that the study results and methodology met
the requirements of the relevant study guideline.
the specific conditions of this test, mineralisation from surface
(pelagic) water is not expected to be a significant method for removal
of t-butyl acetate from the environment.
isolation t-Butyl acetate could be concluded to be persistent in surface
waters under the conditions of this test, however this ignores its main
route of removal from fresh waters which will be from volatilisation to
the atmospheric compartment and subsequent rapid photodegradation
(estimated half-life for atmospheric degradation is 19.7 days).
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