唑螨酯的水解特性

Hydrolysis Characteristic of Fenpyroximate

通过实验室的模拟试验研究了唑螨酯在不同温度、pH值及不同水体条件下的水解动态,以及表面活性剂这一水体常见影响因素对唑螨酯水解的影响。结果表明:在25℃和45℃条件下,pH值的变化对水解速率的影响不大,即水解速率大致相同。在5℃时,水解速率随pH值变化有所不同,呈明显负相关。在3种pH值条件下,唑螨酯在水中的降解规律表现为随着温度的升高,水解速率加快,半衰期缩短。唑螨酯在缓冲溶液中的水解速率与在自然河水中的水解速率相似。随着表面活性剂浓度的增大,对于唑螨酯水解的影响越小。当SDBS质量浓度为10mg/L时的影响最为显著,质量浓度为30、50mg/L时对唑螨酯水解的影响不大,且两者影响程度相当。

The dynamics of fenpyroximate hydrolysis were studied in laboratory simulation experiments at different temperature, pH, different water and by the infulence of SDBS, a common factor. The result showed that fenpyroximate hydrolysis rates were not affected very much by pH under the conditions of 25℃ and 45℃. But under 5℃, hydrolysis rates were different with the change of pH. It indicts the obvious minus relations. Under the three pH condition, the hydrolysis rule of fenpyroximate represented that with the increase of temperature, the hydrolysis rate was quicken, and the half live was shorten. Fenpyroximate hydrolysis rates were similar in distilled and river water. With the increase of SDBS, the influence to fenpyroximate hydrolysis was smaller and smaller. When the concentration of SDBS was 10 mg/L, the influence was most obvious. When the concentration was 30 or 50 mg/L, the influence was not obvious, and the both influences were similar to some degree.