Introduction of hydrogen peroxide as an oxidant in flow injection analysis

Speciation of Cr(III) and Cr(VI)

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Hydrogen peroxide was used as an oxidant in Flow Injection Analysis (FIA). The formation of gaseous components during the analysis was suppressed by maintaining the concentration of hydrogen peroxide lower than 0.15% in 0.1 M NaOH. By this method, Cr(III) was oxidised on-line to Cr(VI) which was detected spectrophotometrically at 548 nm by complexation with 1,5- diphenylcarbazide (DPC). Linear responses were found for concentrations <20 mg/l and the sensitivities obtained of the pure species were 0.02254 ± 0.0015 l/mg for Cr(III) and 0.0420 ± 0.0015 l/mg for Cr(VI). For the speciation of Cr(III) and Cr(VI), the analysis of both species was performed by treating them as mutual interferences. Thus, the total amount of chromium species was measured by FIA and the total amount of chromium was measured by Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The speciation was performed at concentrations above 6 mg/l which is suitable for on- line monitoring of e.g. waste waters.

Original languageEnglish
Pages (from-to)125-131
Number of pages7
JournalAnalytica Chimica Acta
Volume361
Issue number1-2
DOIs
Publication statusPublished - Mar 31 1998

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Flow Injection Analysis
Oxidants
oxidant
hydrogen peroxide
Hydrogen Peroxide
Chromium
Diphenylcarbazide
chromium
Atomic absorption spectrometry
Graphite
Waste Water
Complexation
Spectrum Analysis
Wastewater
Furnaces
complexation
graphite
spectrometry
Monitoring
chromium hexavalent ion

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry

Cite this

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abstract = "Hydrogen peroxide was used as an oxidant in Flow Injection Analysis (FIA). The formation of gaseous components during the analysis was suppressed by maintaining the concentration of hydrogen peroxide lower than 0.15{\%} in 0.1 M NaOH. By this method, Cr(III) was oxidised on-line to Cr(VI) which was detected spectrophotometrically at 548 nm by complexation with 1,5- diphenylcarbazide (DPC). Linear responses were found for concentrations <20 mg/l and the sensitivities obtained of the pure species were 0.02254 ± 0.0015 l/mg for Cr(III) and 0.0420 ± 0.0015 l/mg for Cr(VI). For the speciation of Cr(III) and Cr(VI), the analysis of both species was performed by treating them as mutual interferences. Thus, the total amount of chromium species was measured by FIA and the total amount of chromium was measured by Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The speciation was performed at concentrations above 6 mg/l which is suitable for on- line monitoring of e.g. waste waters.",
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Introduction of hydrogen peroxide as an oxidant in flow injection analysis : Speciation of Cr(III) and Cr(VI). / Andersen, J. E T.

In: Analytica Chimica Acta, Vol. 361, No. 1-2, 31.03.1998, p. 125-131.

Research output: Contribution to journalArticle

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