Study on Fragmentation Behavior of New Typical Cluster Ions of Alkali Metal Nitrates and Nitrites by Electrospray Ionization Tandem Mass Spectrometry
New typical cluster ions of alkali metal nitrates and nitrites were studied in the normal capillary temperature(200℃) by electrospray ionization mass spectrometry(ESI-MS),and their fragmentation behavior was investigated by electrospray multi-stage tandem mass spectrometry(ESI-MSn).The results indicate:(1) There is a similar behavior between cluster ions of NaNO3 solution and those of KNO3 solution studied both by ESI-MS and ESI-MSn;(2) The cluster ions of NaNO2 solution are more complicated than those of NaNO3 and KNO3 solution studied by ESI-MS;(3) cluster ions containing Na+ ions were produced from KNO2 solution during the electrospray process,and it is elucidated that the affinity of Na+ ion to NO-2 is bigger than that of K+ ion by analyzing their ESI-MSn behavior.In addition,the effects of the capillary temperature of the ESI source and the solution concentration on the formation of the cluster ions were also interrogated.