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Published online 2 February 2006
Published in Soil Sci Soc Am J 70:337-346 (2006)
DOI: 10.2136/sssaj2005.0080
© 2006 Soil Science Society of America
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Mutual Interactions of Sulfate, Oxalate, Citrate, and Phosphate on Synthetic and Natural Allophanes

Alejandra A. Jaraa,*, Antonio Violanteb, Massimo Pignab and María de la Luz Moraa

a Dep. de Ciencias Químicas, Univ. de La Frontera, Temuco, Chile
b Dip. di Scienze del Suolo, della Pianta e dell'Ambiente, Univ. di Napoli Federico II, Napoli, Italy


Figure 1
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  		Fig. 1. Adsorption isotherms of (a) phosphate (PO4), oxalate (OX), citrate (CIT), and sulfate (SO4) on AlSiFe at pH 5.5 and (b) PO4, OX, and SO4 on Andisol at pH 5.0, ionic strength 0.1 mol L–1 KCl and 25°C.

 

Figure 2
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  		Fig. 2. Potentiometric titration of AlSiFe in presence of (a) oxalate (OX), (b) citrate (CIT), (c) sulfate (SO4), or (d) phosphate (PO4) (10–4 and 10–3 mmol L–1) at constant ionic strength (0.1 mol L–1 KCl).

 

Figure 3
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  		Fig. 3. Adsorption of (a) sulfate (SO4) and (b) phosphate (PO4) on AlSiFe at different pH values, when added alone or in binary (SO4 + PO4) or ternary (SO4 + CIT + PO4; SO4 + OX + PO4) systems.

 

Figure 4
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  		Fig. 4. Adsorption of (a) sulfate (SO4) and (b) oxalate (OX) on AlSiFe at different pH values, when added alone or in a binary (SO4 + OX) or ternary (SO4 + OX + PO4) systems.

 

Figure 5
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  		Fig. 5. Adsorption of (a) sulfate (SO4) and (b) citrate (CIT) on AlSiFe at different pH values, when added alone or in a binary (SO4 + CIT) or ternary (SO4 + CIT + PO4) systems.

 

Figure 6
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  		Fig. 6. Adsorbed PO4/adsorbed SO4 molar ratio vs. the initial PO4/SO4 molar ratio on AlSiFe at pH 4.5. The concentration of phosphate was constant (1.93 mmol L–1).

 

Figure 7
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  		Fig. 7. Adsorption of sulfate (SO4) at pH 4.5 on Andisol in the presence of increasing concentrations of phosphate (PO4), oxalate (OX), or citrate (CIT). Initial PO4, OX, or CIT/SO4 molar ratio ranging from 0.1 to 1.

 

Figure 8
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  		Fig. 8. Kinetics of adsorption of sulfate (SO4) at pH 4.5 on Andisol (from 0.167 to 360 h) in the presence of phosphate (PO4), oxalate (OX), or citrate (CIT). Initial PO4, OX, or CIT/SO4 molar ratio of 1.

 




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