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The hydrolysis as a function of pH was performed according to OECD Guideline for Testing of Chemicals No. 111 (2004) and EEC Directive 92/69, Section C.7 (1992). The test item was dissolved in aqueous buffer solution, and the temperature and pH were checked at pH 4, 7 and 9 respectively. The decrease of the concentration with time was determined by HPLC. The rate constant and the half-life period were calculated using the slope of the line (the logarithms of the concentration against time). The test results showed that the test substance at pH 4 has a half-life period of 206 hours (9 days) at 25 , at pH 7 is stable with a half-life of more than one year at 25 , and at pH 9 has a half-life period of 867 hours (36 days) at 25 .