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Electrospray-Ionization Time-of-Flight Mass Spectrometry: pH-Dependence of Phosphomolybdate Species

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Abstract:

Electrospray ionization (ESI) time-of-flight mass spectrometry has been used to investigate the pH-dependence of phosphomolybdates in solution from pH = 1.7 to 10.2. Mass spectra are reported for the first time for H2Na2P2Mo5O23 2-, PMo9O31 3-, PMo10O34 3-, and PMo11O37 3-. The pH dependence of phosphomolybdate species as measured by electrospray is compared with measurements reported for combined potentiometry - 31P NMR. The pH ranges of most species are similar (±1 pH unit) when measured by these two methods, although some differences are observed. Protonation and solvation of phosphomolybdate species measured by ESI differ from those observed by 31P NMR. However, the core phosphomolybdate species are measured correctly by ESI.

Keywords: ELECTROSPRAY; MASS SPECTROMETRY; PHOSPHOMOLYBDATES; SPECIATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011953991

Publication date: December 1, 2001

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