Registration Dossier
Registration Dossier
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EC number: 209-909-9 | CAS number: 597-82-0
Endpoint summary
Administrative data
Description of key information
Additional information
Stability in the environment
Photodegradation is not an important environmental fate process, since the substance is not expected to evaporate into the atmosphere due to its low vapor pressure. A hydrolysis study ( OECD 111) was performed to examine the hydrolysis behaviour of the test substance and the assumed transformation product. After up to 30 days of incubation, the half-life of the parent compound was determined to be 24.2 days (pH 9), 102.4 days (pH 7) and 115.8 days (pH 4) at 25 °C. The half-life of the expected transformation product (triphenyl phosphate) after 30 days was determined to be 1.7 days (pH 9), 10.9 days (pH 7) and 77.9 days (pH 4) at 25°C. Increasing phenol concentrations show that both O,O,O-triphenyl thiophosphate and triphenyl phosphate are further hydrolysed under separation of phenol. However, it is to be assumed that the relatively slow abiotic transformation of O,O,O-triphenyl thiophosphate to triphenyl phosphate will be even lower at more relevant temperatures (e.g., 12 °C) and thus abiotic hydrolysis will be rather slow in the environment.
Stability during Use
During use as lubricant additive O,O,O triphenyl thiophosphate degrades to triphenyl phosphate which forms a multilayered solid film on the metal or metal oxide which will be further degraded. In a tribotesting study at 150 °C with poly-α olefin (PAO) it could be shown that the reaction products are pyrophosphate, organo-phosphate and sulfate species. This degradation is metal catalysed. Oxygenated compounds produced by the oxidation of the base oil adsorbed onto the iron surface and reacted with it to form carbonates and carboxylates (Mangolini et al. 2012, 2011; Johnson and Hils 2013).
Mangolini F., Rossi A., Spencer N.D. 2012. Tribochemistry of triphenyl phosphorothionate (TPPT) by in-situ attenuated total reflection (ATR/FT-IR) tribometry. J Phys Chem 116: 5614-5627.
Mangolini, F., Rossi, A., Spencer, N.D. 2011. Influence of metallic and oxidized iron/steel on the reactivity of triphenyl phosphorothionate in oil solution. Tribol Int 4: 670–683.
Johnson, DW and Hils, JE. 2013. Phosphate esters, thiophosphate esters and metal thiophosphates as lubricant additives. Lubricants 1(4): 132-148.
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