Abstract
The ring oven method was used to separate strontium and barium from calcium as sparingly soluble rhodizonates on filter paper discs. The precipitated rhodizonates, on treatment with bromine vapors, form soluble barium and strontium bromides, which, when treated with ammonium metavanadate, precipitate barium as metavanadate. The precipitated barium metavanadate is soluble in hydrogen peroxide solution. The rings obtained by the ring oven technique were developed by an aqueous solution of sodium rhodizonate for strontium and barium and with a freshly prepared aqueous pyrogallol for calcium. For the determinations these rings were compared with standard rings obtained with solutions of known concentrations. The error is within 8%.
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