A New Facile and Sensitive Method for the Spectrophotometric Determination of Chromium
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Department of P.G. Studies and Research in Chemistry, Mangalore University, Mangalagangotri-574 199, India
Online publication date: 2008-11-30
Publication date: 2008-11-30
Eurasian J Anal Chem 2008;3(3):324–334
A simple, rapid and sensitive spectrophotometric method for the indirect determination of trace amounts of chromium(VI) is described. The nitrite generated by the oxidation of hydroxylamine with chromium(VI) is used to diazotize p-aminophenol (PMP). The diazonium salt formed is coupled with isatin (IS) or isonipecotamide (ISO) or frusemide (FRU) in an alkaline medium to form azo dye showing absorption maxima at 524 or 533 or 558 nm respectively. Chromium(III) is determined after it is oxidized to Cr(VI) by bromine water. The range of linearity for PMP – IS, PMP-ISO and PMP-FRU couples are 0.02- 0.6 μg mL-1, 0.04-2.0 μg mL-1 and 0.4-2.0 μg mL-1 of chromium respectively. The molar absorptivity, Sandell sensitivity for each system were calculated. The developed method is successfully applied to the determination of chromium in water samples, soil samples and dietary supplement.
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