It may be estimated by titration with potassium permanganate in acid solution; with potassium ferricyanide in alkaline solution, 2K 3 Fe(CN) 6 +2KOH+H 2 O 2 =2K 4 Fe(CN) 6 +2H 2 0+0 2; or by oxidizing arsenious acid in alkaline solution with the peroxide and back titration of the excess of arsenious
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