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An abiotic degradation study (hydrolysis as a function of pH) was carried out with GR-88-0778 according to OECD guideline n° 111.

Only the preliminary test needed to be performed at pH 4 and pH 7 since, at 50°C, less than 10% hydrolysis occurred after 120 h. A hydrolysis of less than 10% after 120 h, or more, at 50°C corresponds to a half-life time of more than one year at 25°C.

For pH 9 a main test was conducted at 40°C, 50°C and 60°C.

Temperature correlation is weak, with the test substance concentration decreasing faster at 50°C than at 60°C. From this observation, and from the fact that the test substance does not contain hydrolysable groups, it was concluded that processes other than hydrolysis contribute to, or are sole pathways of dissipation of the test substance.

If, despite this conclusion, all dissipation at pH 9 is assumed to be due to hydrolysis, a half-life time of 3161 h (= 131.7 d) at 25°C can be calculated.

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