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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Sodium 2-biphenylate (CAS 132-27-4) is not stable at environmentally relevant conditions. On contact with water the substance dissociates forming NaOH and the conjugate acid 2-phenylphenol (CAS 90-43-7). The determined dissociation constant (pKa) of 2-phenylphenol (CAS 90-43-7) is 9.5. Thus a dissociation of sodium 2-biphenylate and formation of 2-phenylphenol at environmental relevant pH of 5 - 9 can be expected. Dissociation is the main degradation pathway for sodium 2-biphenylate. Sodium 2-biphenylate will most probably not exist in the environment and thus persistency of the target substance can be excluded. The degradation of the conjugate acid 2-phenylphenol was tested in a study following OECD 301B. Ready biodegradability was demonstrated for 2-phenylphenol. Based on the CO2evolution a biodegradation rate of 70.8 – 75.7% was determined (test substance concentration 0.2 mg/L and 1 mg/L, respectively). A rapid degradation in sewage treatment plants (STP) can be expected and the amount of substance released by STP effluent is presumably negligible.

The experimentally determined water solubility ofSodium 2-biphenylate is > 1000 g/L at pH 13.6 and 20 °C. However, as indicated above the substance will dissociate on contact with water. At environmental relevant pH the uncharged form 2-phenylphenol prevails. The measured water solubility range of 2-phenylphenol at pH 5-9 was 0.53 – 0.64 mg/L (at 20 °C). Due to the relatively low water solubility in combination with the rapid biodegradation an accumulation in natural water bodies can be excluded. Sodium 2-biphenylate and 2-phenylphenol have a low adsorption potential. A Koc of 529.3 L/kg for sodium 2-biphenylate was estimated by calculation based on the experimentally determined log Pow of 2.95. A comparable adsorption coefficient of 347 L/kg was determined in an experimental study on 2-phenylphenol. The determined Koc values indicate a moderate mobility in soil. Furthermore, an accumulation in air and the subsequent transport to other environmental compartments is not anticipated due to the low vapour pressure of Sodium 2-biphenylate as well as2-phenylphenol (VP: 1.2 Pa and 0.906 Pa at 20 °C, respectively).