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Position: Home > Articles > Study on Hydrolysis and Soil Degradation of Diflufenican Modern Agrochemicals 2022,21 (1) 42-46

吡氟酰草胺水解及土壤降解研究

作  者：
陈风;王平平;刘新刚;董丰收;徐军;吴小虎;郑永权
单  位：
中国农业科学院植物保护研究所植物病虫害生物学国家重点实验室
关键词：
吡氟酰草胺;水解;好氧降解;积水厌气降解;超高效液相色谱
摘  要：
采用室内模拟试验,利用超高效液相色谱(UPLC)研究了吡氟酰草胺水解和在土壤中的降解特性。结果表明,在0.1～10.0 mg/L范围内,吡氟酰草胺质量浓度与峰面积呈良好的线性关系(R~2≥0.999)。在0.5和10.0 mg/kg添加水平下,吡氟酰草胺在缓冲溶液(pH=4、7、9)中的平均回收率为94.0%～100.0%,相对标准偏差(RSD)为1.2%～6.6%;在土壤中的平均回收率为88.5%～99.2%,RSD为1.4%～4.9%。在水解试验中,吡氟酰草胺在25℃时的水解半衰期分别为1.9、2.5和1.7 d;50℃时分别为0.9、2.5和0.8 d。吡氟酰草胺在不同pH值缓冲溶液中均表现为易水解,且在pH 4和pH 9时水解速率随温度升高而加快。在土壤降解试验中,吡氟酰草胺在好氧条件下的红土、积水厌气条件下的黑土中的降解动力学符合平行双一级动力学模型,其余则符合常规一级动力学模型。在好氧条件下,吡氟酰草胺在红土、潮土、黑土中的降解半衰期分别为630.0、96.3和169.0 d;在积水厌气条件下的半衰期分别为990.0、173.3、133.3 d。2种试验条件下,吡氟酰草胺在红土中均表现为难降解,而在潮土、黑土中均表现为较难降解。
译  名：
Study on Hydrolysis and Soil Degradation of Diflufenican
作  者：
CHEN Feng;WANG Pingping;LIU Xingang;DONG Fengshou;XU Jun;WU Xiaohu;ZHENG Yongquan;Institute of Plant Protection, Chinese Academy of Agricultural Sciences, State Key Laboratory for Biology of Plant Diseases and Insect Pests;
关键词：
diflufenican;;hydrolysis;;aerobic degradation;;water-accumulated anaerobic degradation;;UPLC
摘  要：
In-lab simulation experiments were conducted to investigate the hydrolysis and soil degradation of diflufenican by ultra-performance liquid chromatography(UPLC). The results showed that there was good linear correlation(R2≥0.999) between the concentration of diflufenican and peak area in the range of 0.1-10.0 mg/L. At two fortified levels of 0.5 and 10.0 mg/kg, the average fortified recoveries in buffer solution(pH=4, 7, 9) were 94.0%-100.0%, and the relative standard deviations(RSD) were 1.2%-6.6%. The average fortified recoveries in soils were 88.5%-99.2%, and RSD value were 1.4%-4.9%. In hydrolysis experiment, the hydrolysis half-lives of diflufenican were 1.9, 2.5 and 1.7 d in buffer solution(pH=4, 7, 9) at 25℃, while half-lives were 0.9, 2.5 and 0.8 d at 50℃. Diflufenican was easily hydrolyzable in different pH buffer solution, which was found to be more pronounced with elevated temperature at pH 4 and pH 9. In soil degradation experiment, the degradation behavior of diflufenican conformed to the conventional first-order kinetic model except for red soil under aerobic condition and black soil under water-accumulated anaerobic condition, where degradation behavior of diflufenican referred to the parallel bi-first-order kinetic model. Under aerobic condition, the degradation half-lives of diflufenican in red soil, fluvo-aquic soil, black soil were 630.0, 96.3 and 169.0 d, while half-lives were 990.0, 173.3 and 133.3 d under water-accumulated anaerobic condition. Under two types of above conditions,diflufenican was hard to degrade in red soil, and relatively hard to degrade in fluvo-aquic soil and black soil.

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