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Characterization of silicate monomer with sodium, calcium and strontium but not with lithium and magnesium ions by fast atom bombardment mass spectrometry
Author(s) -
Tanaka Miho,
Takahashi Kazuya
Publication year - 2002
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.323
Subject(s) - chemistry , silicic acid , fast atom bombardment , dissolution , silicate , inorganic chemistry , mass spectrometry , magnesium , strontium , lithium (medication) , sodium , qualitative inorganic analysis , ion , analytical chemistry (journal) , chromatography , medicine , organic chemistry , endocrinology
Fast atom bombardment mass spectrometry (FABMS) was applied to the direct detection of silica species dissolved in LiCl, NaCl, MgCl 2 , CaCl 2 and SrCl 2 solutions in order to investigate its dissolution process in solution. Several species of dissolved silicate complexes in the solution were directly detected by FABMS. The peak intensities of [SiO 2 (OH) 2 Na] − , [SiO 3 (OH)Ca] − and [SiO 3 (OH)Sr] − increased with increasing concentrations of NaCl, CaCl 2 and SrCl 2 , whereas the peak intensities of [SiO 2 (OH) 2 Li] − and [SiO 3 (OH)Mg] − did not increase with increasing concentrations of LiCl and MgCl 2 . These results indicte that silicate and cation bind in the solution not after but before ionization. The isotope pattern of Sr 2+ confirmed the existence of the silicate–Sr complex not only with increase of the concentration of silica but also the mass numbers of Sr. The silicate complexes formed with Na + , Ca 2+ and Sr 2+ showed high stability in chloride solution. This is in good accordance with the fact that Na + , Ca 2+ and Sr 2+ accelerate the dissolution of silica to form complexes during solution equilibrium. Considering that the stability constant was examined and reported in other papers, this new findings that Mg 2+ does not form a complex with silicic acid (Si(OH) 4 ) is very important. Copyright © 2002 John Wiley & Sons, Ltd.