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Are Chelated Foliar Products Truly 100% Chelated? I. Dissociation of Agricultural Foliar Nutrients in Aqueous Environment – Cupric Ions.
12/1/2007
The degree of chelation/dissociation of four commercial products: copper sulfate, a synthetically chelated EDTA copper, an amino acid chelated copper and a multi-ligand chelated copper, in aqueous solutions was analyzed using an ion selective electrode. The highest dissociation was observed in copper sulfate solutions. Chelate dissociation was lowest in EDTA solutions. Multi-ligand solutions showed higher degree of chelation, especially at lower pH, than did amino acid solutions.
Chelate dissociation was lowest in EDTA solutions. Adjusting the pH improved the degree of chelation in the amino acid chelated and the multi-ligand chelated solutions. Multi-ligand solutions showed higher degree of chelation, especially at lower pH, than did amino acid solutions.
 Full Text Article Plant Nut. Sust. Agric. Volume 12 (1) 2007
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