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A test according to OECD guideline 111 was performed to determine the hydrolytical stability of dicyandiamide.

A preliminary test was conducted with an initial test concentration of dicyandiamide of 0.002 mol/L at pH of 4.0, 7.0 and 9.0 at 50 °C. Concentrations of dicyandiamide were measured with HPLC/UV at days 0, 1, 2, 3, 4, and 7.

At pH 7.0 and 9.0 the concentration of dicyandiamide did not change significantly within 7 days. At pH 4.0 the concentration of dicyandiamide at day 7 was 86.6 % of the initial concentration. The hydrolysis rate constant at pH 4.0 was therefore 0.019/d. The concentration of dicyandiamide after 5 days at pH 4.0 was 90.5 % of the initial concentration.

Since less than 10 % of the test substance is hydrolysed in 5 days, in accordance with OECD guideline 111 no further hydrolysis test have to be performed. The test substance dicyandiamide is considered hydrolytically stable.

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