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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The test substance was "readily biodegradable" in a ISO Draft (BOD Test for Insoluble Substances). Diisotridecyl phthalate reached a degradation of 71% after 28 days.

DTDP has also demonstrated a moderate extent of biodegradability in a simulation test using river water, and moderate degree of removal in a wastewater treatability test based on a DT50of <1 day. These data are consistent with modelled data that suggest DTDP will be largely eliminated in a STP. 

Studies were not available to assess the biodegradability of DTDP in sediment. However, the monoester of DIDP (mono-isodecyl phthalate) demonstrated an average half-life of 25 hours in marine sediments. Because the formation of the monoester occurs as the first step in the biotic degradation of DIDP and because this step does not appear to be rate limiting, as evidenced by the high extent of biodegradation demonstrated by DIDP in a ready test, the degradation of the diester in sediment is expected to occur at a similar high rate. Because Di-isodecyl phthalate ester (DIDP) is an analog to DTDP, DTDP is expected to biodegrade in sediment at approximately the same rate as was exhibited by DIDP.

Studies are not available to assess the biodegradability of DTDP in soil. However, data for an earthworm toxicity test suggest DINP, an analog to DTDP, would have a half-life in soil of approximately 51 days. Based on the extent of biodegradability measured using various test procedures, DTDP and its degradation products are expected to biodegrade at a moderate rate under simulated conditions and in sediment and soil.