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DOI: 10.1039/A606413B (Paper) Reference Section for: J. Anal. At. Spectrom., 1997, 12, 503-506

Speciation of Chromium(vi) and Chromium(iii) Using Pneumatically Assisted Electrospray Mass Spectrometry

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ALBIN B. GWIZDALA III, STEVE K. JOHNSON, SAHANA MOLLAH and R. S. HOUK

Abstract

Mass spectra can be obtained from aqueous solutions containing both Cr3+ and Cr2O72- as negative ions under the same spray conditions. An excess of HCl is used so that Cr3+ sprays as an anionic chloro complex. Moderately energetic collision conditions produce CrO3- from CrVI and CrOCl2- from CrIII. Detection limits are 100 and 60 ppb for CrIII and CrVI, respectively. Reasonable calibration curves are provided by plotting the ratio of the analyte signal to that for 37Cl-.

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