Indirect Extraction-Spectrophotometric Determination of Chromium

Telepčáková, M., Andruch, V. and Balogh, I. S. Indirect Extraction-Spectrophotometric Determination of Chromium Chemical Papers, Vol.59, No. 2, 2005, 109-112

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
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Author(s) Telepčáková, M.
Andruch, V.
Balogh, I. S.
Title Indirect Extraction-Spectrophotometric Determination of Chromium
Journal name Chemical Papers
Publication date 2005
Year available 2005
Volume number 59
Issue number 2
ISSN 0366-6352
Start page 109
End page 112
Place of publication Poland
Publisher Versita
Collection year 2005
Language english
Subject 250000 Chemical Sciences
250100 Physical Chemistry (incl. Structural)
250400 Analytical Chemistry
Abstract/Summary An analytical procedure for the indirect spectropimtometric determination of trace amounts of hexavalent chromium in a model sample of water has been developed. Chromium in its hexavalent state is reduced to its trivalent state in the presence of an excess of iodide ion in an acidic medium. The liberated triiodide ion forms with a cationic dye ion associate which is extracted into toluene. The extraction of chromium(Vl) is the highest from a 0.08 mol dm-3 sulfuric acid medium. The intensively coloured complex absorbs at λ = 430 nm. The system obeys Beer's law in the concentration range up to 2 mg dm-3. Corresponding limit of detection (based on 3o) is 0.234 mg dm-3 Cr(VI).
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