FIELD: organic chemistry. SUBSTANCE: product: iron-lignosulfonate complex containing iron (28% by weight), which is soluble in alkaline medium. Reagent 1: sodium salts of lignosulfonic acids. Reagent 2: ferrous sulfate heptahydrate. Reaction conditions: in aqueous medium in the presence of 56% nitric acid. EFFECT: improved method of synthesis. 4 tbl
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