Residue and Safe Application of Imidacloprid on Vegetable Soybean
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摘要: 为了评价吡虫啉在菜用大豆上使用后的残留行为及环境安全性,采用高效液相色谱法研究了菜用大豆中的残留与消解动态,并对其安全使用技术进行示范试验。结果表明,吡虫啉在菜用大豆上的原始沉积量因不同施药处理有所差异,残留消解动态符合一级动力学方程,不同施药处理的消解速率基本趋于一致,消解系数(︱k︱)=0.1863±0.0149,半衰期(DT50)为3.5~3.9 d,消解99%所需要的时间(T99)为22.9~26.0 d。在菜用大豆接近采收时,按常规施药方法,每667m2施用吡虫啉有效成分3.00g,施药1次的在施药后3 d残留量均1.0 mgkg-1,残留量平均为0.299 mgkg-1;间隔7 d连续施药2次的,在第2次施药后5 d的残留量均1.0mgkg-1,残留量平均为0.374 mgkg-1,产品质量安全水平均达到日本、美国的MRL要求。Abstract: To determine the changes in residue and environmental safety of imidacloprid application on soybeans used as a vegetable,HPLC and field experimentation were conducted.At the same time,a safe application method of the insecticide was developed.The result showed that(a) the imidacloprid degradation followed first order kinetic,(b) the initial imidacloprid residue amount varies with method of application,(c) the degradation rates were basically the same,(d) the degradation coefficient,(︱k︱),was 0.186 3±0.014 9,(e) the DT50 was 3.5-3.9 d,and(f) the T99 was 22.9-26.0 d.The soybeans were sprayed with 3.00 g of effective imidacloprid per 667 m2 near time of harvest.The insecticide residues,3 days after the application,were all less than 1.0 mgkg-1,averaging 0.299 mgkg-1.When the spray was applied twice at 7d interval,the residues were all less than 1.0 mgkg-1 averaging 0.374 mgkg-1,5d after the second spray.The residue levels on the soybeans were all below the Japanese or American MRL requirements.
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Key words:
- vegetable soybean /
- imidacloprid /
- residual content /
- degradation dynamics /
- safe application
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[1] 杜春秀.吡虫啉研究概况[J].海南大学学报:自然科学版,2004,22(1):84-88. [2] 吴刚,吴云华,鲍晓霞,等.高效液相色谱法分析茶叶中吡虫啉残留量[J].理化检验:化学分册,2005,41(10):768-769. [3] 谢文,丁慧瑛,蒋晓英,等.液相色谱-串联质谱检测蔬菜和茶叶中吡虫啉的残留量[J].色谱,2006,24(6):633-635. [4] AMADEO R F-A,ANA T,ANA A.Determination of im idacloprid and benzim idazole residues in fruits and vegetables by liquid chromatography-mass spectrometry after ethyl acetate multi-residue extraction[J].J AOAC International,2000,83(3):748-755. [5] NAVALON A,GONZALEZ CASADO A,EL-RHATTABI R,et al.Determination of im idacloprid in vegetable samples by gas chromatography-mass spectrometry[J].Analyst,1997,122(6):579-581. [6] 杨红,章维华.吡虫啉在烟草中的残留动态研究[J].南京农业大学学报,1999,22(3):80-82. [7] 郑永权,董丰收,陶华为,等.两种吡虫啉种衣剂在棉花和土壤中的残留动态研究[J].农业环境科学学报,2004,23(1):177-180. [8] 剧晓青,邓新平,罗公树.吡虫啉在茶叶和茶园土壤中的残留研究[J].西南农业大学学报,2006,28(3):471-474. [9] 朱亚红,于志光,吴俐勤,等.康福多在水稻和土壤中的残留分析[J].浙江农业学报,2000,12(6):400-403
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