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Copyright © 2012 by The Geochemical Society of Japan. phenomenon presenting important implications for environmental problems (Wittbrodt and Palmer, 1996, 1997; Kožuh et al., 2000). Reduction-oxidation studies of Cr in soils have mainly targeted estimation of the reduction kinetics and stability constants (complexation capacities), or have addressed the presence of Cr(VI) (Fukushima et al., 1995; Wittbrodt and Palmer, 1995, 1996, 1997; Nakayasu et al., 1999; Kožuh et al., 2000). Information about the detailed chemical structure of Cr in nature is also necessary for complete understanding of toxicity and stability. However, determining a chemical state of Cr during or after a reaction process of Cr(VI) and soils is challenging because the soil system is too complex for speciation studies of Cr. Analysis using X-ray absorption fine structure (XAFS) spectroscopy is effective for determination of a valence state and a chemical form of metals in heterogeneous materials because it yields information with elemental selectivity obtained through Speciation study of Cr(VI/III) reacting with humic substances and determination of local structure of Cr binding humic substances using XAFS spectroscopy

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Speciation study of Cr(VI/III) reacting with humic substances and determination of local structure of Cr binding humic substances using XAFS spectroscopy