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摘要
The microwave plasma torch (MPT) is a novel ambient ion source with multi-advantages, including low-power consumption, easy operation, simple construction, strong excitation ability, and so on. Previous studies showed that the MPT ion source coupled with a mass spectrometer is a promising analytical tool in various fields. Adopting the desolvation unit and the central-tube injection of MPT, the MPT mass spectrometer can detect directly the metal ions in water, without tedious sample pretreatment. And this instrumental method is sensitive enough for some toxic heavy metals with limit of detection(LOD) down to the level of several 10(-8) g/L. For instance, for lead and cadmium, the LOD values can reach 20x10(-9) and 71x10(-9) g/L, respectively. Thus the MPT mass spectrometer can be used as the supplementary of ICP-MS and have potential applications in field analysis. To expland the applications of microwave plasma torch (MPT)-MS in metal element analysis in water, the further researches about the feature MPT mass spectra of transition metal elements are necessary. This article presented firstly the MPT mass spectra of some common transition metal elements in negative ion mode of linear ion trap (LTQ) mass spectrometer and clarified the regularity of the metallic anions. These metals include: manganese, iron, cobalt, nickel, copper and zinc. Moreover, primer results showed that the LOD for these transition metal ions in water are the levels of 10(-5) g/L. These results established the basic of the practical applications of MPT mass spectrometer in the fields of environment controlling and the water quality inspection.
- 出版日期2016-5-10
- 单位辽宁省环境监测中心站; 东华理工大学
