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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

The half-life of t-butylphenyldiphenyl phosphate (TBPDPP) in a river die-away test was 1 day at 50 and 500 ppb levels. 

Key value for chemical safety assessment

Half-life in freshwater:
1 d
at the temperature of:
24 °C

Additional information

A river die-away study involved exposure of S-154 to Mississippi River water in sealed bottles. The die-away or decrease in concentration of the test chemical was monitored as a function of time by sacrifice and analysis of selected bottle contents.Rapid biotransformation rates were observed for the S-154 major components, triphenyl phosphate (TPP) and t-butylphenyldiphenyl phosphate (TBPDPP), with half lives of <0.5 and 1 day respectively at 50 and 500 ppb levels. A lesser component, di(t-butylphenyl) phenyl phosphate (DTBPPP) disappeared more slowly with a half life of 7 days. In autoclaved river water, the composite half life for all components was 29 days indicating that chemical transformation was not a significant route.