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 ⇌ 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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