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EC number: 276-380-9
CAS number: 72140-65-9
MTDID 15670 and its hydrolysis products are not expected to be
persistent in aquatic systems.
MTDID 15670 is hydrolytically active, but was not meaningfully degraded
in an ready biodegradation test. It could not be determined whether
MTDID 15670 was inhibitory to biodegradation. QSAR modeling of the two
organic hydrolysis products, crotononitrile and dodecyl ethyl sulfide,
showed that the crotonitrile should be readily biodegradable while
dodecyl ethyl sulfide would be more resistant to degradation. The
predicted biodegration pathways for dodecyl ethyl sulfide involve
mercaptan (thiol) formation. Since free sulfhydril groups are toxic to
many microorganisms but would only be created over time, inhibition of
activated sludge would not be shown during a short-term OECD 209
respiration inhibition test. In fact, MTDID 15670 did not reach 50%
inhibition to activated sludge respiration even at a loading rate of
1000 mg/L. However, organisms capable of metabolizing sulfoethers are
widespread in the environment. The training set of the QSAR model
included the structural analog dihexyl sulfide, which was 57% degraded
in an OECD 301C assay, and was inherently biodegradable (information
from Japan Chemicals Collaborative Knowledge database). By multiple
lines of evidence, dodecyl ethyl sulfide is also not expected to be
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