Spectrophotometric method for the determination of chromium (VI) in water samples.
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.
Nagaraj
P
P
Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka State, India. nagarajap58@yahoo.co.in
Aradhana
N
N
Shivakumar
Anantharaman
A
Shrestha
Ashwinee Kumar
AK
Gowda
Avinash K
AK
D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry; D002857:Chromium / Q000032:analysis*; D003622:Dapsone / Q000032:analysis / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods*; D019811:Hydroxylamine / Q000032:analysis / Q000737:chemistry; D009281:Naphthalenes / Q000032:analysis / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
D001391:Azo Compounds; C510366:N-(1-naphthalene-1-yl)ethane-1,2-diamine dihydrochloride; D009281:Naphthalenes; D014874:Water Pollutants, Chemical; D014867:Water; D002857:Chromium; D019811:Hydroxylamine; D003622:Dapsone