欧盟农残分析质量控制程序在质谱确认一节中的一段话; Where the increased sensitivity obtained by scanning a limited mass range or by SIM is essential,the general minimum requirement is for data from two ions of m/z>200;or three ions of m/z>100,preferably including the molecular ion.For a few analytes,where these minimum requirements may not be achievable,ions with m/z<100 may also provide supporting evidence.However,ions arising from common moieties may be of little use,as are cationised molecules or adducts,such as[M+NH4]+,formed in LC-MS.Intensity ratios obtained from the more characteristic isotopic ions,e.g.those containing Cl or Br,may be of particular utility.The selected diagnostic ions should not exclusively originate from the same part of the parent molecule.
其中的ions arising from common moieties may be of little use,as are cationised molecules or adducts,such as[M+NH4]+,formed in LC-MS一句不很明白，望赐教! 最后一句的diagnostic ions指的是定性离子吗？from the same part of the parent molecule指什么啊？母分子的同一部分？ 请大家帮帮忙！
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