ditions as calcium, it is entirely possible that magnesium can be estimated in the filtrate from the calcium oxalate precipitation.
ACKNOWLEDGMENTThe authors wish to express their appreciation to L. P. Pepkowitz and J. F. Flagg for helpful suggestions during the course of this work and for reviewing the manuscript.
LITERATURE CITED(1) Assoc. Offic. Agr. Chemists, "Official and Tentative Methods of Analysis," 6th ed., p. 654, 1945.
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