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Description of key information

At 25°C after seven days GEL-ALL-MD appeared to be stable in both neutral and alkaline solution but unstable under acidic conditions. No prediction is made for the behaviour of the test material over a longer period.

Key value for chemical safety assessment

Additional information

The hydrolysis characteristics of Gel-All-MD have been studied at 25°C, under abiotic conditions. Solutions at three pHs (approximately pH 4, 7 and 9) were analysed over a seven day period. A significant and consistent drop in concentration was only observed under acidic conditions. This indicates that the test material is subject to acid catalysed hydrolysis.

At pH 3.95 a 45% drop in concentration was observed over a 7 day interval:

Initial concentration: 0.74 mg/l solution

final concentration: 0.41 mg/l solution

The reaction was shown to obey pseudo-first order kinetics and the following parameters were obtained:

observed rate constant: 3.50 x 10-3/h

half life: ca 200 hours

Gel-All-MD was found to be stable over seven days at pH 7 and at a pH of 9.06