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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis is not relevant in regard to abiotic degradation in the environment (DT50 > 1 yr).

Key value for chemical safety assessment

Additional information

The hydrolysis of OPP (CAS-No. 90-43-7) was studied in sterile aqueous buffered solutions at pH 4 (phthalate buffer), pH 7 (phosphate buffer) and pH 9 (borate buffer) according to OECD guideline 111. The concentrations of OPP were measured via HPLC-UV. In the preliminary test at 50 °C, a percentage of OPP of less than 10% was hydrolysed during 5 days. According to OECD guideline 111, the test substance is considered to be hydrolytically stable and no further testing is required (Reusche, 1991). This result corresponds to a half-life of far more than one year.