FIELD: disinfecting and bleaching agents. SUBSTANCE: claimed method comprises heating aqueous mixture containing perchlorate ions, chlorate ions, hydrogen ions in the presence of oxygen-liberating catalyst selected from VIII group metals or oxides thereof. Perchlorate ion to chlorate ion molar ratio is at least 0.5:1. The resulting chloride dioxide does not essentially contain chlorine. The claimed method does not envisage producing acid salt intermediate product. EFFECT: more efficient preparation method. 21 cl, 3 tbl
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