A highly sensitive spectrophotometric determination of chromium using leuco Xylene cyanol FF

A highly sensitive and selective spectrophotometric method was developed for the determination of trace amounts of chromium with leuco Xylene cynaol FF. The method is based on the oxidation of leuco Xylene cyanol FF (LXCFF) to its blue form of Xylene cyanol FF by chromium(VI) in sulphuric acid mediu...

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Bibliographic Details
Published in:Talanta (Oxford) 2003-05, Vol.60 (1), p.1-8
Main Authors: Revanasiddappa, H.D, Kiran Kumar, T.N
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chromium determination
Exact sciences and technology
Leuco Xylene cyanol FF
Spectrometric and optical methods
Spectrophotometry
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Summary:A highly sensitive and selective spectrophotometric method was developed for the determination of trace amounts of chromium with leuco Xylene cynaol FF. The method is based on the oxidation of leuco Xylene cyanol FF (LXCFF) to its blue form of Xylene cyanol FF by chromium(VI) in sulphuric acid medium (pH 1.2–2.4), the absorbance of the formed dye is measured in an acetate buffer medium (pH 3.0–4.6) at 615 nm. The method obeys Beer's law in the concentration range of 0.05–0.45 μg ml −l chromium, having molar absorptivity and Sandell's sensitivity of 8.23×10 4 l mol −1 cm −l and 0.00063 μg cm −2, respectively. All the variables were studied in order to optimise the reaction conditions. The developed method has been successfully applied to the determination of chromium in steels, pharmaceutical samples, industrial effluents, natural water, and soil.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(02)00567-2