The Estimation of Calcium in Blood-Serum

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Abstract
In this (a modification of the Kramer and Tisdall method), the Ca is precipitated as oxalate, converted into CaCO3 by heating the centrifuge tube in which it is separated and washed, and the CaCO3 titrated with acid. The end point is more distinct than that of a permanganate titration, and all washing is carried out with saturated ammonium oxalate, thus avoiding errors due to the solubility of calcium oxalate in water. By using a micrometer syringe, 1 cc. only of serum is required and smaller quantities down to 0.1 cc. give results accurate enough for most purposes.

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