A comparative study of methods for precipitating calcium oxalate from homogeneous solution.
A PFHS of calcium oxalate has been examined and the optimum conditions for the precipitation established. This method, and two other methods employing PFHS for the gravimetric determination of calcium as the oxalate are compared with the conventional and acetic acid-medium methods. All the methods work well in the absence of magnesium, but the urea hydrolysis procedure, in the absence of an initial precipitate, is recommended as the best method when magnesium is present. Crystal sizes have been measured by microscopy.
Bashar
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Department of Chemistry, University of Birmingham, Edgbaston, Birmingham 15 UK.
Townshend
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