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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis_OECD 111/EU Method C.7_ Half life > 1 year for pH 4, 7, 9 at 25°C

Key value for chemical safety assessment

Half-life for hydrolysis:
1 yr
at the temperature of:
25 °C

Additional information

The hydrolysis of the Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts (generic name: C20-24 sodium sulfonate) has been determined according to a procedure compatible with OECD Guideline 111 and EU Method C.7 in compliance with GLP (Fox, 2015a). Based on the Critical Micelle Concentration of the substance (10 mg/L; please refer to Fox, 2015c), a test concentration of 2 mg/L was chosen (less than half the approximate water solubility of the test item). This was also significantly below 0.01M.

The hydrolysis of the substance was investigated for pH 4, 7 and 9 at 50 °C for a total test duration of 145.75 h. HPLC-MS has been used as analytical method. Test concentrations were determined after 0, 24, 120 and 145.75 h based on absolute standard concentrations. Overall the results demonstrated that the test item was hydrolytically stable for greater than a year at 25 °C at pH 4, pH 7 and pH 9. Less than 10 % hydrolysis occurred after 5 days at the indicated pH values, respectively.