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Environmental fate & pathways

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Partitioning of substances into the different environmental compartments depends mainly on their physico-chemical properties. Several experimental studies confirmed that 2-phenylphenol (OPP) (CAS-No. 90-43-7) is readily biodegradable according to the OECD criteria (70.8-75.7% biodegradation after 28 d). Furthermore, the results of studies investigating the biodegradation in soil (DT50 = 2.7 h) and the phototransformation in water show a rapid degradation of OPP. Therefore, OPP will not be persistent in the environment.

The degradation via abiotic hydrolysis is not considered to be a relevant degradation pathway in the environment since QSAR results using HYDROWIN v2.00 resulted in a half-life (DT50) of >1 yr at pH 7. The substance shows a moderate adsorption behavior (log Koc = 2.4 – 2.6). Evaporation into air and the transport through the atmospheric compartment is not expected, since OPP is not volatile based on the low vapour pressure (VP: < 1 Pa). Accumulation in air and the subsequent transport to other environmental compartments is not anticipated. However, if released into air, OPP is susceptible to indirect photodegradation by OH-radicals with a DT50: < 24 h (AOPWIN v1.92). Due to the low BCF value of 21.7, bioaccumulation in aquatic organisms is not expected.