Spectrophotometric method for the determination of chromium (VI) in water samples
P Nagaraj1, N Aradhana, Anantharaman Shivakumar
1Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka State, India. nagarajap58@yahoo.co.in
Abstract:
A simple and sensitive spectrophotometric method for the determination of chromium has been developed. The method is based on the diazotization of Dapsone in hydroxylamine hydrochloride medium and coupling with N-(1-Napthyl) Ethylene Diamine Dihydrochloride by electrophilic substitution to produce an intense pink azo-dye, which has absorption maximum at 540 nm. The Beer's law is obeyed from 0.02-1.0 microg mL(-1) and the molar absorptivity is 3.4854 L mol(-1) cm(-1). The Limits of quantification and Limit of detection of the proposed method are 0.0012 microg mL(-1) and 0.0039 microg mL(-1) respectively. The method has been successfully applied for the determination of chromium in water samples and the results were statistically evaluated with that of the reference method.
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