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Environmental fate & pathways

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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.