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The determination of the hydrolysis as a function of pH was based on EEC Directive C.10 "Abiotic degradation: Hydrolysis as a function of pH"(1984). At pH 4, 7 and 9, a decrease in concentration > 50% was observed after 2.4 hours (half-life time < 2.4 hours). Hence it was concluded that the concerned substance is hydrolytically unstable at pH 4, 7 and 9 under the conditions of the test. The test was performed at 50.0 ± 0.5°C.