On-line Electrochemical Oxidation of Cr(III) for the Determination of Total Cr by Flow Injection–Solid Phase Spectrophotometry

MATSUOKA, Shiro and NAKATSU, Yu and TAKEHARA, Kô and Saputro, Sulistyo and YOSHIMURA, Kazuhisa (2006) On-line Electrochemical Oxidation of Cr(III) for the Determination of Total Cr by Flow Injection–Solid Phase Spectrophotometry. ANALYTICAL SCIENCES, 22. pp. 1519-1524.

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    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 cm3 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 cm3. 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.

    Item Type: Article
    Subjects: Q Science > Q Science (General)
    Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Matematika
    Depositing User: mr azis r
    Date Deposited: 22 May 2013 21:11
    Last Modified: 22 May 2013 21:11
    URI: https://eprints.uns.ac.id/id/eprint/837

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