New method for determination of serum calcium

Abstract
We propose a new method for determining calcium in serum, based in precipitation, in the State of oxalate, in a filtering funnel of Jena glass; washed in same with a saturated solution of calcio oxalate, disolution of the precipitate with diluted hot nitric acid and the determination of the proportion of the oxalic in the filtrate by permanganimetrics. Four determinations can easily be affected within an hour. The standard deviation is 0,33 mgrs. % and systematic errors are absolutely avoidable.
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