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.

Resonance-ionization mass spectrometry of carbon

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