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首页> 外文期刊>Analytical Sciences >Oxidation of Chromium(III) by Free Chlorine in Tap Water during the Chlorination Process Studied by an Improved Solid-Phase Spectrometry
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Oxidation of Chromium(III) by Free Chlorine in Tap Water during the Chlorination Process Studied by an Improved Solid-Phase Spectrometry

机译：改进固相法研究氯化过程中自来水中游离氯氧化铬（Ⅲ）

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摘要

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.
机译：采用改进的固相分光光度法研究了自来水加氯过程中游离氯对自然浓度浓度（μgdm-3或更低）Cr（III）的氧化作用。特定测定Cr（VI）的浓度为μgdm-3或更低。在三种不同的pH条件下研究了pH对氧化动力学的影响。结果表明，如果次氯酸盐浓度较高，则游离氯将假三阶动力学氧化为Cr（III）为Cr（VI），在pH 5.0、7.0和8.0时半衰期分别为3.0、3.3和14.4 h。维持在4 mg Cl dm-3。

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