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Perturbation of Taranakite Formation by Ferrous and Ferric Iron under Acidic Conditions

^a Dep. of Soil Science, Univ. of Saskatchewan, 51 Campus Drive, Saskatoon, SK Canada S7N 5A8
^b The Institute of Soil Science, Academia Sinica, P.O. Box 821, 71 East Beijing Road, Nanjing 210008, China

View larger version (23K): [in a new window]   Fig. 1 X-ray diffractograms of the precipitates formed at 1 M NH4H2PO4, 10-2 M Al, pH 4.0, and various Fe(II)/Al molar ratios. The aging period was 4 wk at 23°C

View larger version (24K): [in a new window]   Fig. 2 X-ray diffractogram of the precipitates formed at 1 M NH4H2PO4, 10-2 M Al, pH 4.0, and various Fe(III)/Al molar ratios. The aging period was 4 wk at 23°C

View larger version (26K): [in a new window]   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

View larger version (33K): [in a new window]   Fig. 4 Infrared spectra of the precipitates formed at 1 M NH4H2PO4, 10-2 M Al, and pH 4.0 in different iron oxidation state system. The aging period was 3 wk at 23°C

View larger version (24K): [in a new window]   Fig. 5 X-ray diffractograms of the precipitates formed at 1 M NH4H2PO4, pH 4.0, an Fe/Al molar ratio of 1.2, and different Al concentrations: (a) Fe(II), , (b) Fe(II), , (c) Fe(III), , and (d) Fe(III), . The aging period was 3 wk at 23°C