Speciation of Chromium(vi) and Chromium(iii) Using Pneumatically Assisted Electrospray Mass Spectrometry
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Analytical Atomic Spectrometry
- Vol. 12 (5) , 503-506
- https://doi.org/10.1039/a606413b
Abstract
Mass spectra can be obtained from aqueous solutions containing both Cr 3+ and Cr 2 O 7 2- as negative ions under the same spray conditions. An excess of HCl is used so that Cr 3+ sprays as an anionic chloro complex. Moderately energetic collision conditions produce CrO 3 - from Cr VI and CrOCl 2 - from Cr III . Detection limits are 100 and 60 ppb for Cr III and Cr VI , respectively. Reasonable calibration curves are provided by plotting the ratio of the analyte signal to that for 37 Cl - .Keywords
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