代森锰锌在辣椒和土壤中的残留动态

[目的]研究代森锰锌在辣椒及土壤中的残留动态。[方法]于2008～2009年在长沙、广州和北京三地分别开展田间施药试验和室内分析试验,研究代森锰锌在辣椒及土壤中的消解动态和最终残留,采用气相色谱法进行定量分析。[结果]研究所用残留分析方法,辣椒和土壤中代森锰锌的平均回收率分别为86.59%～93.03%、92.57%～95.14%。代森锰锌在辣椒和土壤中消解较快,其半衰期分别为2.29～4.65 d和4.01～4.65 d。在辣椒上使用精甲霜灵.代森锰锌水分散粒剂,按照推荐使用剂量最多施药3次（每次间隔5 d）,最后一次施药3 d后,采收的辣椒中代森锰锌的残留量均小于2 mg/kg。[结论]研究结果为代森锰锌安全使用标准的制定奠定了基础。

Residue Dynamics of Mancozeb in Chilli ( Capsicum annuum Linn) and Soil

[Objective]The paper was to study the residue dynamics of mancozeb in chilli and soil.[Method] Field spraying test and indoor analysis were carried out in three places of Changsha,Guangzhou and Beijing City during 2008-2009 to study the degradation dynamics and the final residue of mancozeb in chilli and soil,and gas chromatography was used for quantitative analysis.[Result]The average recovery rates of mancozeb in chilli and soil were 86.59%-93.03% and 92.57%-95.14%,respectively.Mancozeb had rapid digestion in chilli and soil with the half-life of 2.29-4.65 and 4.01-4.65 d,respectively.When metalaxyl-M·mancozeb WDG was used in chilli according to the recommend dosage(spraying for three times at most with the spraying interval of 5 d),3 d later after the last spraying,the final residue of mancozeb in chilli collected was less than 2 mg/kg.[Conclusion]The result provided basis for preparation of safety standards of mancozeb.