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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

DTDP exhibited 13 and 63% biodegradation after 28 and 56 days, respectively, in an extended ready biodegradability test, 37% biodegradation after 28 days in a study that assessed biodegradability using non acclimated river water, 52% biodegradation in a 1-day study to determine a degradation rate with an acclimated inoculum that originated from a sewage treatment plant, and ≥90% biodegradation after 12 days with an acclimated inoculum.  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 (i. e., wastewater treatment) and in sediment and soil.

Key value for chemical safety assessment

Additional information

DTDP is inherently biodegradable and has been shown to biodegrade to a high extent in an extended ready biodegradation test using a standard OECD test guideline. It 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. DTDP exhibited 63% biodegradation after 56 days, in an extended ready biodegradability test. Biodegradation data for a mono ester that is a mixture containing approximately equal amounts of monoesters with normal octyl (n-C8) and normal decyl (n-C10) side chains are available to assess the potential biodegradability of the primary transformation product.  Results show that this mixture is readily biodegradable (Scholz, 2003). MTDP is expected to exhibit an equally high extent and rapid rate of biodegradation as was demonstrated by MC8/10PE.