乙蒜素乳油在黄瓜和土壤中的残留消解动态

Ethylicn Residue Dynamics in Cucumber and Soil

采用田间试验，对乙蒜素乳油在长沙、广州、山东、北京四地的黄瓜及土壤中的残留进行了研究，结果表明乙蒜素在黄瓜中的消解速度较快，乙蒜素在黄瓜中半衰期分别为广州3．47d，长沙1．37d，山东2．10d，北京3．18d；乙蒜素在土壤中半衰期分别为广州3．34d，长沙2．46d，山东2．60d，北京2．89d；41％乙蒜素乳油兑水稀释1500倍（乙蒜素浓度为33．75mg·L^-1），使用2次，末次施药7d后，乙蒜素在未检出-0．011mg·kg^-1，在土壤中为未检出。该药属于易降解农药（T1/2〈30d），按推荐剂量使用是安全的。

In order to make up a standard procedure for safe use of ethyliein （ the active ingredient of 41% in mixed formulation） on citrus, a field experiment was conducted to reveal the residue dynamics and residues of ethyliein in citrus and soil distributed in Changsha, Guangzhou, Beijing and Shandong four place. Half- lives of Ethylicn in cucumber and soil at Changsha were 1.37 and 2. 46 d. Half- lives of Ethylicn in cucumber and soil at Guangzhou were 3.47 and 3.34 d. Half- lives of Ethylien in cucumber and soil at Shandong were 2. 10 and 2. 60 d, respectively, while half- lives at Beijing were 3. 18 and 2. 89 d, respectively. When the citrus was sprayed two times with ethylicin 41% E. C dilution of （ 1 ： 1500 concentration of ethylicin was 33. 75mg · L^-1）, at the 7th day after the last application, the final residues of ethyliein in cucumber and soil were ND -0. 011 mg · kg^-1, ND - ND, respectively, suggesting that ethyliein belonged to non- persistent pesticides （T1/2 〈 30 d）. The result could offer certain scientific experimental reference for reasonably using the ethylicin and appraising its environmental security in China.