Hill C A, Thomas C L P
Department of Instrumentation and Analytical Science, UMIST, PO Box 88, Manchester, UK M60 1QD.
Analyst. 2003 Jan;128(1):55-60. doi: 10.1039/b207558j.
A pulsed corona discharge ionisation source, a candidate replacement for 63Ni ionisation sources for ion mobility spectrometry, is described along with a new design of ion mobility spectrometer-mass spectrometer. Preliminary research on the characterisation of the reactant ion peaks associated with the use of this ionisation source was undertaken by assembling a pulsed corona discharge ionisation switchable high-resolution ion mobility spectrometer-mass spectrometer to enable the mobility spectra, atmospheric chemical ionisation mass spectra and selected-mass mobility spectra to be obtained. With ammonia doping at 2.39 mg m(-3) in air and a water content of approximately 80 mg m(-3) in the positive mode the observed response was attributable to the formation of 1(H2O)(n)NH4]+ and [(H2O)n(NH3)NH4]+ in the reaction region. The observed responses in the negative mode were more complex with evidence for the formation [(H2O)(n)O2]-, [(H2O)(n)CO3]-, [(H2O)(n)HCO3]-, [(H2O)(n)CO4]- and [(H2O)(n)NO3]-. The responses due to these species were clearly discernible in the resultant mobility spectra, with enough oxygen-based species formed to support analytically useful responses.
本文介绍了一种脉冲电晕放电电离源，它是用于离子迁移谱的63Ni电离源的候选替代品，同时还介绍了一种新型的离子迁移谱仪-质谱仪设计。通过组装一台脉冲电晕放电可切换高分辨率离子迁移谱仪-质谱仪，对与该电离源使用相关的反应物离子峰进行了初步表征研究，以获取迁移谱、常压化学电离质谱和选择质量迁移谱。在空气中氨掺杂量为2.39 mg m(-3)且含水量约为80 mg m(-3)的正模式下，观察到的响应归因于反应区域中1(H2O)(n)NH4]+和[(H2O)n(NH3)NH4]+的形成。负模式下观察到的响应更为复杂，有证据表明形成了[(H2O)(n)O2] -、[(H2O)(n)CO3] -、[(H2O)(n)HCO3] -、[(H2O)(n)CO4] -和[(H2O)(n)NO3] -。这些物种产生的响应在所得的迁移谱中清晰可辨，形成了足够的氧基物种以支持具有分析用途的响应。
