Oxidation of Chromium(III) by Free Chlorine in Tap Water during the Chlorination Process Studied by an Improved Solid-Phase Spectrometry

SAPUTRO, Sulistyo and YOSHIMURA, Kazuhisa and TAKEHARA, Kô and MATSUOKA, Shiro and NARSITO, (2011) Oxidation of Chromium(III) by Free Chlorine in Tap Water during the Chlorination Process Studied by an Improved Solid-Phase Spectrometry. ANALYTICAL SCIENCES , 27. pp. 649-652.

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    Abstract

    The oxidation of Cr(III) at naturally-occurring concentration levels, i.e., μg dm or lower levels, by free chlorine during the chlorination process of tap water was studied using an improved solid-phase spectrophotometric method, which can be directly applicable to the specific determination of Cr(VI) at μg dm–3 or lower levels. The effect of the pH on the oxidation kinetics was investigated under three different pH conditions. The results showed that free chlorine oxidized the Cr(III) to Cr(VI), following the pseudo-first-order kinetics with half lifetimes of 3.0, 3.3 and 14.4 h at pH 5.0, 7.0 and 8.0, respectively, if the hypochlorite concentration was maintained at 4 mg Cl dm–3 .

    Item Type: Article
    Subjects: Q Science > Q Science (General)
    Q Science > QD Chemistry
    Divisions: Lembaga Penelitian dan Pengabdian Kepada Masyarakat - LPPM
    Depositing User: Anis Fagustina
    Date Deposited: 02 May 2014 16:08
    Last Modified: 02 May 2014 16:08
    URI: https://eprints.uns.ac.id/id/eprint/14255

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