Registration Dossier
Registration Dossier
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EC number: 204-800-2 | CAS number: 126-73-8
Endpoint summary
Administrative data
Description of key information
Additional information
Biodegradation
Biodegradation in water: screenig test.
Several studies that investigated the readily biogradability of tributyl phosphate, considered the substance as readily biodegradable.
Bioaccumulation
The bioaccumulation of tributylphosphate was investigated in a continuous exposure system in Killifish (Sasaki et al, 1982). The test substance was taken up rapidly into the fish, reaching steady state within 24 hours. Levels remain constant for the remainder of the study. BCF values were calculated to be 21 -35. Following removal from the test water, elimination was rapid with a BH value (biological half-life) of 1.25 hours. Levels were below the LOD at 24 hours.
The bioaccumulation of the substance from water was investigated in carp over a period of 6 -8 weeks (CITI, 1992). BCF values for fish of 6.9 -20 were calculated for the substance at a concentration of 6 µg/L in water; BCF values of 5.5 -10 were calculated for a concentration in water of 60 µg/L.
Transport and distribution
The organic carbon partition coefficient (Koc) for tributyl phosphate was predicted using the QSAR calculation of the Estimation Program Interface (EPI) Suite v 4.11. The Koc was estimated to be 1724 L/kg (logKow method), and 2350 L/kg (MCI method). The results relate to the unaffected molecule of the substance as any decomposition (e.g. hydrolysis) of the substance is not taken into account by the program.
Additional information on environmental fate and behaviour
A study was conducted to measure the effects of soil of the dunes on the removal and modification of organic compounds (including tributyl phosphate) present in water of the river Rhine during dune-infiltration as a treatment step in drinking water production. This was performed to indicate potentially harmful compounds that occur regularly in water of the river Rhine and in spite of soil passage may occur in drinking water derived from that source. 0.1 µg/L of tributylphosphate was found in the infiltrating water detected after infiltration at Well 8 in North Holland.
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