摘要
建立了将代森锰锌分解为二硫化碳、顶空气相色谱法(电子捕获检测器)测定荔枝中代森锰锌残留量及将乙撑硫脲转化为S-乙撑硫脲,气相色谱法(氮磷检测器)测定荔枝中乙撑硫脲残留量的方法.代森锰锌在0.25～4.00 μg含量范围内,色谱峰高的对数与农药含量平方的对数呈现良好的线性关系,相关系数为0.999;荔枝果肉中代森锰锌的回收率为96.0%～103.3%,相对标准偏差为3.54%～5.51%(n=3),定量下限为1.0×10-10g.乙撑硫脲线性范围为0.25～5.00μg/mL,荔枝果肉中乙撑硫脲的回收率为87.3%～105.6%,相对标准偏差为3.22%～4.63%(n=3),定量下限为5.0×10-10g.应用该法测定了实际荔枝样品中代森锰锌与乙撑硫脲的残留量,并对其进行了安全性分析.
Mancozeb residues in Lichi were determined bydecomposingmancozeb to CS 2 ,and then detected by headspace gas chromatography(GC)with electron capture detector.The metabolismproduct ETUin Lichi was detected by GC with nitrogen phosphorus detector upon conversion of ETUinto S-ETU.The logarithm of the chromatograph peak height of mancozeb(lny)was linear with respect to the logarithm of the square of its conˉtent(lnm 2 )when the mancozeb residue amountwas in the range of0.25～4.00μg.Recoveries of mancozeb in spiked Lichi samples were more than96%with relative standard deviation in the range of3.54%～5.51%(n=3).The minimumdetectable quality for mancozeb was less than0.1ng.The linear range of the method for determining ETUwas0.25～5.00μg/mL.Recoveries of ETUin spiked Lichi samples were more than87%withrelative standard deviationinthe range of3.22%～4.63%(n=3).The minimumdetectable qualiˉty for ETU was less than0.5ng.Measured mancozeb and ETU concentrations in actual Lichi samples and their safety analysis were also reported.
出处
《分析测试学报》
CAS
CSCD
北大核心
2005年第2期92-94,97,共4页
Journal of Instrumental Analysis
