The significance of the CrO(4)2- chemical equilibrium HCr(4)- equilibrium in the determination of chromium(VI) by flame spectrometry |
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| Authors: | Cresser M S Hargitt R |
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| Affiliation: | Department of Soil Science, University of Aberdeen, Old Aberdeen, Scotland. |
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| Abstract: | Chromium atomic absorption for Cr(VI) solutions in the air-acetylene and air-hydrogen flames is pH-dependent, but not in the nitrous oxide-acetylene flame. The effect is shown to occur as a result of the HCrO(-)(4) chemical equilibrium CrO(2-)(4) equilibrium, and may cause significant errors in the determination of chromium by atomic-absorption Spectrometry unless the pH of sample and standard solutions is controlled. |
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