Oxidation of chromium(III) by free chlorine in tap water during the chlorination process studied by an improved solid-phase spectrometry

Sulistyo Saputro; Kazuhisa Yoshimura; Kô Takehara; Shiro Matsuoka; Narsito

doi:10.2116/analsci.27.649

Oxidation of chromium(III) by free chlorine in tap water during the chlorination process studied by an improved solid-phase spectrometry

Sulistyo Saputro, Kazuhisa Yoshimura, Kô Takehara, Shiro Matsuoka, Narsito

Inorganic and Analytical Chemistry

Research output: Contribution to journal › Comment/debate

7 Citations (Scopus)

Abstract

The oxidation of Cr(III) at naturally-occurring concentration levels, i.e., μg dm ^-3 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 . 2011

Original language	English
Pages (from-to)	649-652
Number of pages	4
Journal	analytical sciences
Volume	27
Issue number	6
DOIs	https://doi.org/10.2116/analsci.27.649
Publication status	Published - 2011

All Science Journal Classification (ASJC) codes

Analytical Chemistry

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Saputro, S., Yoshimura, K., Takehara, K., Matsuoka, S., & 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(6), 649-652. https://doi.org/10.2116/analsci.27.649

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abstract = " The oxidation of Cr(III) at naturally-occurring concentration levels, i.e., μg dm -3 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 . 2011",

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AU - Matsuoka, Shiro

AU - Narsito,

PY - 2011

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N2 - The oxidation of Cr(III) at naturally-occurring concentration levels, i.e., μg dm -3 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 . 2011

AB - The oxidation of Cr(III) at naturally-occurring concentration levels, i.e., μg dm -3 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 . 2011

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