Prom 5 to 40 t~g. of magnesimn csn be determined by measuring the turbidity formed when the potassium salt of erucic acid is added in the presence of potassium oxalae. Preliminary removal of calcium as oxalate is achieved rapidly at room temperature; other milk components do not interfere. Analysis of various samples of milk and serum by the present technique showed that, eompal-ed with ashed samples, direct analysis gave results which agreed within 3.3%. The method is simple, convenient, and suitable for routine analysis.
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Marier et al. (1959) studied this question.
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