On-line electrochemical oxidation of Cr(III) for the determination of total Cr by flow injection-solid phase spectrophotometry

Shiro Matsuoka, Yu Nakatsu, Kô Takehara, Sulistyo Saputro, Kazuhisa Yoshimura

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15 Citations (Scopus)

Abstract

A novel on-line oxidation method of ultra-trace Cr(III) dissolved in natural water has been developed using a flow electrolysis cell. This method was successfully applied to the determination of the total Cr concentration by flow injection-solid phase spectrophotometry using diphenylcarbazide as a coloring agent. With the applied potential of 1.35 V (vs. Ag/AgCl) and the flow rate of 0.80 cm 3 min -1 , Cr(III) was quantitatively oxidized to Cr(VI) at room temperature. The total Cr concentration of sub-μg dm -3 in 3 - 4 samples could be determined within 1 h using an aqueous sample volume of 7.1 cm 3 . The analytical values of the total Cr concentration in natural water were in good agreement with those obtained by ICP-MS. The detection limit of the proposed method was 0.014 μg dm -3 (3σ, n = 7). This method could be applied to the specific determination of Cr(III) and Cr(VI) in river water samples. 2006

Original languageEnglish
Pages (from-to)1519-1524
Number of pages6
Journalanalytical sciences
Volume22
Issue number12
DOIs
Publication statusPublished - Dec 2006

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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