title: Study on chemical speciation in aluminum chloride solution by ESI-Q-MS.
abstract: AlCl(3) solution was analyzed at concentrations from 0.02 to 100 mM using an electrospray ionization quadrupole mass spectrometer (ESI-Q-MS), and the dissolution state of aluminum ions is discussed. Results obtained using ESI-Q-MS were consistent with those obtained using (27)Al nuclear magnetic resonance ((27)Al NMR). Aluminum species existed mainly as positively charged monomeric aluminum hydroxide coordinated with several water molecules in solution. The complexation of chloride ions by aluminum ions differed between the positive and negative ion modes. Chemical reactions that partially modified chemical forms of species through ESI-Q-MS measurement were also observed. In the same aluminum chloride solution, using ESI-TOF-MS and ESI-Q-MS/MS studies, the disagreement of the reports is discussed. It is concluded that ESI-TOF-MS might show also the gas-phase reaction in the mass spectrometer but the dissolution state of aluminum species can be shown by ESI-Q-MS.
authors.affiliation: Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo 108-8477, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Urabe
authors.forename: Miho
authors.initials: M
authors.lastname: Tanaka
authors.forename: Shin
authors.initials: S
authors.lastname: Kumakura
authors.forename: Takahisa
authors.initials: T
authors.lastname: Tsugoshi