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In a study according to OECD Guideline 111 the ph-dependent hydrolysis of Acetoguanamine in water was determined. A stock solution containing 1000 mg/L of the test item in demineralised water was mixed with buffer solutions (pH values: 4; 7; and 9) in a 1:1 ratio. The resulting solutions were sterilized by filtration over a 0.2 µm Nylon filter, purged with Argon and stored at 50 °C for a period of five days. Samples were analysed at the beginning and after five days. The analysis of the samples (performed with HPLC/UV) showed no significant changes in the concentration of the test item within five days.Therefore, Acetoguanamine can be considered as hydrolytically stable at these pH values.