4408-81-5Relevant academic research and scientific papers
Iron chelate solutions
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, (2008/06/13)
A method for the preparation of an aqueous solution of iron polyprotic acid chelate complexes, comprising reacting a solution of a mixture of a first polyprotic acid or a salt thereof, said first acid being capable of chelating iron, and a second polyprotic acid or a salt thereof, said second acid being capable of chelating iron and being different from the first acid, with iron in the presence of an oxidizing agent, with the proviso that at least part of the carboxylic acid groups in the first and second acids is present in salt form and at least part of the carboxylic acid groups in the first and second acids is present in acid form. Preferably, the first and second polyprotic acids may be selected from ethylenediaminetetraacetic acid (EDTA), N-hydroxyethyl-ethylenediaminetriacetic acid (HEDTA), and diethylenetriaminepentaacetic acid (DTPA), and the iron is selected from Fe-powder, Fe(OH)2 and FeCO3. Part of the polyprotic acid groups in the first and second acids is present in the salt form, the salt being selected from ammonium and alkali metal ions, in particular K , Na and mixtures thereof. The method makes it possible to obtain aqueous solutions containing high contents of iron, such as up to approximately 7% by weight of iron, for use as a plant nutrient, mainly in soil-free plant culturing.
