Phosphorus extraction by anion exchange membranes (AEM) in Andisols
1998
Hernandez-Moreno, J.M. | Negrin, M.A.
Phosphorus (P) extraction by anion exchange resin membranes (AEM, IONICS) was studied in two Andisols from a greenhouse experiment with corn (Zea mays L.). Membranes were sequentially eluted with sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). More P was extracted in the later. Resin eluents were fractionated for P and the different P fractions were correlated with crop yield. In the NaCl eluents, iron (Fe) and silicon (Si) were detected. In addition, aluminum (Al) and organic carbon (OC) were found in the bicarbonate eluents. Strong correlations were observed between P, Al, and OC in the resin eluents corresponding to the different P treatments. Phosphorus increased with OC and Al, suggesting that added inorganic P had reacted with complexes of the type: humus-Al-OH (to humus-Al-P), and that soil adherence to membranes were not aleatory.
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