Five procedures were compared for E.D.T.A. determination of calcium and magnesium in milk. The method which combined Ling's method for removal of proteins and phosphates by potassium metastannate, Flashka's indicator (Eriochrome blue S E) for the calcium determination, his adjustment of pH in the magnesium determination, and the method of Jenness (slightly modified) for magnesium yielded the best results. The method is convenient, rapid, and recoveries for both calcium and magnesium were essentially 100%.
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Bird et al. (1961) studied this question.
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