Indirect extraction-spectrophotometric determination of chromium

M. Telepčáková, V. Andruch, I. Balogh

Research output: Contribution to journalArticle

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Abstract

An analytical procedure for the indirect spectrophotometric 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(VI) 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 3σ) is 0.234 mg dm -3 Or(VI).

Original languageEnglish
Pages (from-to)109-112
Number of pages4
JournalChemical Papers
Volume59
Issue number2
Publication statusPublished - 2005

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Chromium
Ions
Toluene
Iodides
Sulfuric acid
Limit of Detection
Coloring Agents
Dyes
Water
chromium hexavalent ion

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Indirect extraction-spectrophotometric determination of chromium. / Telepčáková, M.; Andruch, V.; Balogh, I.

In: Chemical Papers, Vol. 59, No. 2, 2005, p. 109-112.

Research output: Contribution to journalArticle

Telepčáková, M, Andruch, V & Balogh, I 2005, 'Indirect extraction-spectrophotometric determination of chromium', Chemical Papers, vol. 59, no. 2, pp. 109-112.
Telepčáková, M. ; Andruch, V. ; Balogh, I. / Indirect extraction-spectrophotometric determination of chromium. In: Chemical Papers. 2005 ; Vol. 59, No. 2. pp. 109-112.
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