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Fig. 11. Ratio of oxalate extractable Fe (Fe_o) to total extractable Fe (Fe_t) in synthetic Fe oxides formed by titrating to four pH values (4, 7.5, 11, and 12) and stored as aqueous suspensions in the dark over a period of 56 d. Note similarity of Fe_o/Fe_t for iron oxides synthesized at pH 4 and pH 7.5 and that the Fe_o/Fe_t ratio is very near to 1.0. Pairs of lines represent oxides synthesized from chloride and nitrate salts.