Observation of chemical reactions at the solid-water interface by quick XAFS combined with a column reactor

被引：13

作者：

Mitsunobu, Satoshi ^{[1
]}

Takahashi, Yoshio

Uruga, Tomoya

机构：

[1] Hiroshima Univ, Grad Sch Sci, Dept Earth & Planetary Syst Sci, Hiroshima 7398526, Japan

[2] Hiroshima Univ, Lab Multiple Isotope Res Astro & Geochem Evolut, Hiroshima 7398526, Japan

[3] JASRI, SPring 8, Sayo, Hyogo 6795198, Japan

来源：

ANALYTICAL CHEMISTRY | 2006年 / 78卷 / 19期

关键词：

D O I：

10.1021/ac060961h

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A simple method for the observation of the kinetics of the reactions at the solid-water interface was developed using quick X-ray absorption fine structure combined with a column reactor. We applied the method to the oxidation reaction of As(III) by manganese oxide, a strong oxidizer in natural systems. A reliable reaction rate constant k', 3.9 x 10(-4) %(-1) min(-1) at pH 7.1, was obtained, where the effect of photooxidation under X-ray beam can be eliminated. Considering the average Mn/As molar ratio in the system, the value is reasonable compared with other reported values. Since this method is very simple, we can apply it to various elements and reaction systems at the solid-water interface as a tool to understand the kinetics of various reactions in detail.

引用

页码：7040 / 7043

页数：4

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