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Fig. 4 | Geochemical Transactions

Fig. 4

From: Effects of common groundwater ions on chromate removal by magnetite: importance of chromate adsorption

Fig. 4

Chromium surface speciation at the magnetite-water interface as a function of pH (4.02 ± 0.1 and 9.04 ± 0.03) and electrolyte concentrations. High and low pH values correspond to pH 9 and 4, respectively. a Pre-edge features of Cr XANES spectra from Cr(VI) reacted magnetite under 0.0016 M (low SO4) and 0.016 M (low SO4) Na2SO4. b  % Cr(VI) fraction in the sorption samples shown in Fig. 4a. c Pre-edge features of Cr K-edge XANES spectra from Cr(VI) reacted magnetite under 0.01 M (low NO3) and 0.1 M (high NO3) NaNO3. d Data assessed by XANES pre-edge analysis shown in Fig. 4c. The fraction of  % Cr(VI) was estimated using the Cr(VI)standard curve in Fig. 3

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