FIELD: purification of inorganic reagents. SUBSTANCE: when removing coloring substances such as iron, chlorine, and bromine from hydrochloric acid, first iron is removed, basically by means of filtration and ion exchange, and then, to acid, nitrogen-containing reducing agent is added, preferably hydroxylamine (better hydroxylamine hydrochloride)-containing one in stoichiometric excess. EFFECT: enhanced purification efficiency. 7 cl, 2 tbl
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