Precipitation of calcium oxalate from homogeneous solution by cation release.
Calcium oxalate can be precipitated from homogeneous solution by oxidation of the calcium/EDTA complex with hydrogen peroxide in boiling solution, in the presence of oxalate ion, at pH 6-8. The method gives large crystals and enables calcium to be determined in the presence of lead, which remains complexed.
Grzeskowiak
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Department of Chemistry Thames Polytechnique, London, S.E. 18, U.K.
Turner
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