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Solid-Phase Iron Characterization During Common Selective Sequential Extractions

Dep. of Geological and Environmental Sciences, Stanford Univ., Stanford, CA 94305-2115 USA

View larger version (23K): [in a new window]   Fig. 1 First-derivative XANES spectral features common to standard and unknown samples. The three main XANES spectral peaks used for qualitative Fe analysis are the pre-edge, main-edge, and post-edge

View larger version (25K): [in a new window]   Fig. 2 First-derivative XANES spectra of Fe standards

View larger version (24K): [in a new window]   Fig. 3 First-derivative Fe XANES spectra of solids remaining after each extraction step. SSE 0 is initial soil prior to extraction; SSE 2 solids remaining after water soluble, magnesium chloride, and sodium hypochlorite extractions

View larger version (21K): [in a new window]   Fig. 4 Second-derivative Fe XANES spectra of solids remaining after each extraction step