KOMPETISI ANION ORGANIK DAN ANORGANIK DALAM MEMBENTUK KOMPLEKS DENGAN ALLOFAN DALAM UPAYA PERBAIKAN KETERSEDIAAN FOSFAT PADA ANDISOL (original) (raw)

In soil, low molecular weight organic acids (LMWOAs) secreced by plant root, microorganisms, and decomposition of organic matter are a great source of organic ligans. Organic and anorganic ligans compete to site clay mineral sorption of soil. Interaction among two or more ligans has a great importance for understanding adsorption/desorption ligans. To understanding adsorption/desorption ligans of andisol with it's allophanes is most interesting. The SO 4 adsorption of allophanes was inhibitted markedly by present amount equimolar of oxalate, citrate, or PO 4 . Capacity of citrate to prevent SO 4 adsorption was gretar than oxalate, but similar with PO 4 . Efectivity of citrate, oxalate and PO 4 to prevent SO 4 adsorption by allophanes decreased with increased time reaction. The SO 4 adsorption lower influence by oxalate + PO 4 than influence by just oxalate, but similar influence by just PO 4 , show that oxalate in the binary sistem SO 4 + PO 4 not inhibited adsorption of SO 4 . On the contrary, PO 4 + citrate markedly inhibited SO 4 adsorption than SO 4 + PO 4 and SO 4 + citrate. In the ternary system, PO 4 strongly inhibited oxalate and citrate adsorption. Efficiency of PO 4 to inhibited oxalate and citrate adsorption was similar. In the ternary system, efficiency of oxalate and citrate to inhibited PO 4 adsorption lower than PO 4 to inhibited citrate and oxalate adsorption by allophanes. Adsorption of one molar PO 4 by allophanes may be exchanged by four molar of SO 4 . Citrate and PO 4 moved allophanes ZPC to lower pH than oxalate, but SO 4 not moved allophanes ZPC. Inhibited adsorption one ligan by anather ligan due to change in the electric potential of surface of clay mineral after anion added, and compete among ligans to the same surface site. Compete among ligans to adsorption site effect to pH, surface sorbent coverage by ligan, sorbent properties, and time reaction.

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