Preliminary investigation of aluminium fluoride complexes in aqueous solutions with CE/ESI-MS and CE/ICP-MS.

Author(s) Tanaka, M.; Hoshino, Y.; Nakamoto, D.
Journal Rapid Commun Mass Spectrom
Date Published 2019 May 30

RATIONALE: It is crucial to identify and confirm the original species of aluminium ions (Al ) dissolved in water, since they behave differently. Depending on their species, the toxicity differs. Capillary electrophoresis (CE) coupled with electrospray ionization mass spectrometry (ESI-MS) and CE coupled with inductively coupled plasma mass spectrometry (CE/ICP-MS) were explored to identify and determine simple systems of Al species solutions at pH 3.0.

METHODS: The new combination of techniques, namely, ESI-MS coupled with CE for identification of species and ICP-MS coupled with CE for confirmation, were applied to for the analyses of Al and fluoride (F) solutions.

RESULTS: Al monomers, some Al dimers and trimers were detected by CE-ESI-MS. CE-ICP-MS experiments were conducted with the assembled interface. As a result, the calibration line showed R = 0.9856, and the detection limits were 35 nL and 0.037 μM. The results were compared with data obtained using MINEQL+.

CONCLUSIONS: Most of the Al species detected were monomers, some dimers and trimers were detected by CE-ESI-MS, but they were not detected by CE-ICP-MS probably owing to extremely low concentrations. The aluminium speciation technique was improved by CE-ESI-MS, and the Al species present at extremely low concentrations were ascertained by CE-ICP-MS. The use of coupled instruments will be one of the most powerful tools for identifying dissolved metal ions.

DOI 10.1002/rcm.8499
ISSN 1097-0231
Citation Rapid Commun Mass Spectrom. 2019.

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