Spectrophotometric determination of trace amounts of chromium with citrazinic acid

Revanasiddappa, H. D. and Kiran Kumar, T. N. (2001) Spectrophotometric determination of trace amounts of chromium with citrazinic acid. JOURNAL OF ANALYTICAL CHEMISTRY, 56 (12). pp. 1084-1088. ISSN 10.1023/A:1012928731437

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A sensitive and selective spectrophotometric method for the determination of trace amounts of chromium(VI) is described, based on diazotization and coupling reactions. Chromium(VI) oxidizes hydroxylamine in acetate buffer of pH 4.0 +/- 0.5 to nitrite, which then diazotizes p-aminoacetophenone to form diazonium salt. The diazonium salt is then coupled with a new coupling agent, citrazinic acid in an alkaline medium, which gives an azo dye with an absorption maximum at 470 nm, a molar absorptivity of 2.12 x 10(4) L mol(-l) cm(-1), and a Sandell's sensitivity of 0.00246 mug/cm(2). The color is stable for 6 h and the system obeys Beer's law in the range 2-15 mug chromium(VI) in a final volume of 10 mL. The detection limit of chromium(VI) is 0.04 mug/mL. Chromium(III) can be determined after it is oxidized with bromine water in an alkaline medium to chromium(VI). The developed method has been successfully applied to the analysis of chromium in alloy steels, industrial effluents, and pharmaceutical preparations.

Item Type: Article
Subjects: Physical Sciences > Chemistry
Divisions: PG Campuses > Manasagangotri, Mysore > Chemistry
Depositing User: Users 12 not found.
Date Deposited: 17 Apr 2013 09:19
Last Modified: 30 Aug 2013 08:07
URI: http://eprints.uni-mysore.ac.in/id/eprint/4592

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