Lee Y W, Westcott N D
J Assoc Off Anal Chem. 1979 Jul;62(4):782-5.
A gas chromatographic-single ion mass spectrometric method was developed for determining dimethoate residues in wheat plants. The base peak (m/e 37) of dimethoate was chosen as the single ion peak, and methyl stearate was used as an internal standard for this analysis. The minimum detectable concentration of dimethoate by this method was about 0.1 ppm for a 20 g wheat plant sample. The recoveries of dimethoate were about 89% at 0.13 ppm and greater than 96% at 0.5-1 ppm.
建立了一种气相色谱 - 单离子质谱法测定小麦植株中的乐果残留量。选择乐果的基峰（m/e 37）作为单离子峰，并使用硬脂酸甲酯作为内标进行此分析。对于20克小麦植株样品，该方法测定乐果的最低检测浓度约为0.1 ppm。乐果在0.13 ppm时的回收率约为89%，在0.5 - 1 ppm时大于96%。
