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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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Diss Factsheets

Environmental fate & pathways

Biodegradation in soil

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Description of key information

DIUP is expected to have a half-life in soil similar to DINP, approximately 51 days.

Key value for chemical safety assessment

Additional information

Studies are not available to assess the biodegradability of DIUP specifically in soil. However, data for an analog substance di-isononyl phthalate (DINP) can be used to estimate the loss rate of DIUP in soil. DINP exhibited a half-life in soil of approximately 51 days, based on the loss of parent substance (ExxonMobil, 2009b). These data were developed in an earthworm toxicity test conducted in soil in which the concentration of DINP was monitored over a 56-day period. During that period DINP concentration decreased from 982 to 441 mg/kg soil (wet weight). Because DIUP and DINP exhibited similar extents of biodegradation in ready biodegradability tests, they would be expected to biodegrade in soil at similar rates and to similar extents.