哒螨灵在香蕉和土壤上残留消解动态  

Dissipation Dynamics of Residual Pyridaben in Bananas and Soils

作　　者：陈丽萍[1] 蔡恩兴[1] 郭建辉 杨淑娟[1] 

机构地区：[1]漳州市农业检验监测中心,福建漳州363000 [2]漳州市土壤肥料与生态能源站,福建漳州363000

出　　处：《现代农药》2011年第5期40-43,共4页MODERN AGROCHEMICALS

基　　金：福建省农业科技计划重点项目(2007N0067)

摘　　要：采用气相色谱法及田间试验方法,研究哒螨灵在香蕉及其土壤上的残留消解动态。结果表明,哒螨灵在香蕉上的原始沉积量较低,<0.250 mg/kg,施用加倍剂量的原始沉积量与施药后14 d内的残留量均明显高于施用推荐剂量,该两个处理在施药后21 d的残留量均<0.005 mg/kg。哒螨灵在香蕉及其土壤上的残留消解规律符合一级动力学关系,在香蕉上的相关系数r=0.900 3～0.915 6(P<0.01),消解系数k=0.246 85±0.007 95,半衰期T1/2为2.8 d～2.9 d,消解99%所需要的时间T0.99为18.1 d～19.3 d;在土壤上r=0.9115(P<0.01),k=0.1450,T1/2为4.8 d,T0.99为31.8 d。在香蕉采收时最终产品及其土壤上均未检出哒螨灵残留。The dissipation dynamics of residual pyridaben in bananas and soils were determined by gas chromatography（GC/ECD） and field trials.Results showed that the initial depositions of the pyridaben in bananas was lower（ 0.250 mg/kg）,which of the treats of double dosage application and at the first 14 d after application were remarkably above that of the recommendation dosager application,then,they were both under 0.005 mg/kg at the 21d after application.The dissipation of pyridaben in bananas and soils could be well fitted by the first-order kinetics.In bananas,the correlation coefficients r located between 0.9003 and 0.9156（P 0.01）,the degradation coefficient k was 0.2468 5 ± 0.0079 5,the half-life period T1/2 ranged from 2.8 d to 2.9 d,and T0.99（the time needed for 99% of pesticide dissipation） ranged from 18.1 d to 19.3 d;while in soils had the r,k,T1/2 and T0.99 parameters of 0.9115（P 0.01）,0.1450,4.8 d and 31.8 d,respectively.The pyridaben residues in marketable bananas and soils couldn＇t still be detected.

关 键 词：香蕉 土壤 哒螨灵 残留 消解动态 

分 类 号：S481.8[农业科学—农药学]