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Environmental fate & pathways

Hydrolysis

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Description of key information

The hydrolysis of the substance has been tested using a protocol similar to OECD TG 111 and in compliance with EEC Methods for the determination of ecotoxicity, Directive 92/69/EEC (OJ No. L383A, 29. 12. 92), Part C, Method C7. Degradation: Abiotic degradation: hydrolysis as a function of pH). 
Hydrolysis was evaluated at 50oC in aqueous solutions at pH 4, 7 and 9. The starting concentration was circa 15 mg/l. At each time point, including 0 hours, 2.4 hours and 5 days, an aliquot of test solution was diluted with mobile phase and the concentration of the substance determined by HPLC analysis. Under the preliminary test condition, the substance was found to undergo hydrolysis at pH 4, 7 and 9, which indicated a half-life of between 1 day and 1 year at 25oC and therefore a full study was carried out. Under the test conditions in the first test at 50oC, the substance was found to undergo a pseudo first order reaction at pH 4, 7 and 9 and therefore the final test was performed at 60 and 70oC. The results in this test showed that Salicynalva possesses half-life times in water of 25.9 days at pH4, 15.4 days at pH 7 and 4.7 days at pH 9 at 25°C.

Key value for chemical safety assessment

Half-life for hydrolysis:
15.4 d
at the temperature of:
25 °C

Additional information