Development of determination method of inorganic ions by electrospray ionization mass spectrometry

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A determination method of inorganic ions by electrospray ionization mass spectrometry (ESIMS) has been developed. Several sample pretreatment systems including an on-line desalting system based on electrodialysis were developed to eliminate matrix effects of samples. Chromate analyses of some samples were achieved by directly measuring hydrogen chromate ion (m/z 117) by ESIMS. Moreover, it was found that dehydration reaction of inorganic oxo acids and carboxylates occurs at the interface of electrospray and their products give strong mass signals. Thus, their applications to the trace determination of the oxo acids are now being studied. New determination methods of CN- and SCN- were developed based on ternary complex formation reactions.