Direct analysis of hexavalent chromium in water samples by UV-Vis spectrophotometry: Effects of pH and the presence of foreign ions
Volume 7, Issue 02, Pages 18-28, Jun 2024 *** Field: Analytical Chemistry
Abstract
The present study aims to characterize the direct UV-Vis spectrophotometric analysis of hexavalent chromium (CrVI) in aqueous solution. The effects of pH and the presence of different ions are evaluated. The results obtained show that at pH ≤ 6, Cr(VI) analysis must be carried out at 350 nm. The Beer-Lambert law is respected for a concentration lower than 100mg Cr(VI) L-1. At pH ≥ 8, the analysis must be performed at 372 nm. In this case, the linearity range of the standard curve does not exceed the concentration of 25 mg Cr(VI) L-1. In the pH range 6 <pH < 8, the direct Cr(VI) analysis cannot be performed. Whatever the pH of the solutions, the presence of acetate, oxalate, citrate, and tartrate with a concentration ten times higher than that of Cr(VI), has no effect. At pH 2, only the presence of Fe(II) and Fe(III) ions prevents the direct determination of Cr(VI) ions. In the presence of metallic ions [Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II)), Cr(VI)] analysis must be carried out at pH 2. At higher pH, these ions have a significant effect.
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