FIELD: inorganic synthesis. SUBSTANCE: mixed potassium-sodium ferrate(VI) K3Na(FeO4)2 is prepared by adding 30-45% potassium hydroxide aqueous solution to equal volume of 30-45% sodium hydroxide aqueous solution containing 0.1-0.3 mole/l ferrate(VI) ion. EFFECT: enabled preparation of a novel compound manifesting strong and selective oxidant activity, which can be, for instance, used in manufacture of chemical current sources, in waste water treatment, and in organic synthesis. 2 cl, 3 ex
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