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
Partitioning of substances into the different environmental compartments depends mainly on their physico-chemical properties. Since the water solubility of O,O,O-triphenyl phosphorothioate is low (0.02 mg/L) and log Pow (5) and log Koc (5.31) are high, the substance will mainly distribute to sediment and soil. Abiotic degradation and biodegradability is slow under environmental conditions and thus O,O,O-triphenyl phosphorothioate will be very persistent in the environment. In a study investigating the aerobic mineralisation of O,O,O-triphenyl phosphorothioate in surface water according to OECD 309 (Schwarzkopf, 2021) a DT50 > 61d was determined. Thus, O,O,O-triphenyl phosphothoriate is considered very persistent in the environment.
O,O,O-triphenyl phosphorothioate is not expected to evaporate into the atmosphere due to the low vapor pressure. Thus, long-range transport through the atmospheric compartment is not expected. Abiotic degradation might occur. 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.
Based on a weight of evidence approach it can be concluded that the bioaccumulation potential is high. The BCF is assumed to be above 2000 and below a BCF of 5000. Thus, the substance is considered to be bioaccumulative (b) but not very bioaccumulative (not vb).
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