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EC number: 249-079-5
CAS number: 28553-12-0
DINP is readily biodegradable and is not
expected to persist in the environment, based on results from standard
ready biodegradation tests, simulation tests, and a study that assessed
DINP loss from soil. The biological half-life of DINP in the aquatic
environment is 10.3 days, approximately 1 day under wastewater treatment
conditions, and 51 days in the soil compartment. Studies are not
available to assess the biodegradability of DINP in sediment. However,
the monoester of DINP (mono-isononyl phthalate) demonstrated an average
half-life of 23 hours in aerobic marine sediments. Because the formation
of the monoester occurs as the first step in the biotic degradation of
DINP and because this step does not appear to be rate limiting, as
evidenced by the high extent of biodegradation demonstrated by DINP in a
ready test, the degradation of the diester in aerobic sediment is
expected to occur at a similar high rate as demonstrated in soil.
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