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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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The mono ester of di-isodecyl phthalate (mono isodecyl phthalate, MIDP) exhibited a relatively rapid rate of biodegradation in a natural aerobic marine sediment, with a measured half-life of 25 ± 6 hours, based on the results of two replicates. Isodecyl benzoate is similar in structure to MIDP, and expected to exhibit a similar half-life.

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Additional information

The mono ester of di-isodecyl phthalate (mono isodecyl phthalate, MIDP) was found to biodegrade at a relatively rapid rate in a natural aerobic marine sediment, with a measured half-life of 25 ± 6 hours, based on the results of two replicates. The investigators also evaluated the biodegradability of other mono phthalate esters (MPEs) in marine sediment and some MPEs in freshwater sediments and found that, in general, all the MPEs exhibited relatively similar half-lives in marine and freshwater sediment, ranging from 16 to 39 hours. Although the biodegradability of mono isodecyl phthalate was not evaluated in freshwater sediment, based on biodegradation data for other MPEs in both sediments, mono isodecyl phthalate would also be expected to exhibit a half-life in freshwater sediment equivalent to its half-life in marine sediment. Based on these data, the structurally similar Isodecyl benzoate is expected to exhibit a half-life in sediment under aerobic conditions similar to the measured half-life of MIDP.