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Fig. 5. X-ray diffractograms of synthetic Fe oxides 4 d old, formed by titration of Fe(III) chloride with KOH to a pH value of 4, 7.5, 11, and 12. Note two broad peaks for ferrihydrite (Fh) at 0.26 and 0.15 nm, and goethite (G) peaks are more pronounced in iron oxides formed at higher pH.