Fig. 3 X-ray diffractograms of the precipitates formed at 1 M NH₄H₂PO₄, 10^-2 M Al, pH 4.0, and various Fe/Al molar ratios under different redox conditions: (a) , (b) Fe(III), , (c) Fe(II), , and (d) Fe(II) +N₂H₄, . The aging period was 3 wk at 23°C

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