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Environmental fate & pathways

Hydrolysis

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Description of key information

pH 7 t1/2 = 9.8 days at 25°C
pH 9 t1/2 = 0.1 days at 25°C

Key value for chemical safety assessment

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

Additional information

The abiotic degradation of the test item and the hydrolysis rate as a function of the pH-value was determined according to the consolidated version of Guideline 67/548/EEC Annex V (Council Directive 92/69/EEC) Part C: Methods for determination of ecotoxicity. C.7. abiotic degradation: hydrolysis as a function of pH and OECD test guidelines No. 111 (2004), Hydrolysis as a function of pH. The study was performed in accordance with the Principles of Good Laboratory Practice (GLP) and reported with a GLP certificate.

 

At pH 4 less than 10% of the reaction is observed after 5 days at 50°C (t1/2 > 1 year at 25°C). Thus the test substance may be considered hydrolytically stable and according to the European Commission Regulation (EC) No. 440/2008 no additional testing is required.

At pH 7 the half-life period was determined by extrapolation of the results of the experiments at 20°C, 40°C and 50°C to a temperature of 25°C. It was found to be 9.8 days.

At pH 9 the half-life period was determined by extrapolation of the results of the experiments at 10°C, 15°C and 20°C to a temperature of 25°C. It was found to be 0.1 days.

The hydrolysis product was identified as Sodium 1-amino-4-(3-ethenesulfonyl)-phenylamino)-9,10-dioxo-4a,9,9a,10-tetrahydroanthracene-2-sulfonate.