Calcium Determinations in Kinetic Studies

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Abstract
A new procedure for the determination of urinary calcium concentrations as low as 1 mg./L. is presented. Calcium is separated from interfering urinary constituents by oxalate precipitation with strontium carrier and then determined by emission flame photometry. Small calcium losses in the separation procedure are estimated by 47Ca-tracer technics. Wet-ashing ensures complete exchange of tracer and sample calcium. Experimental evidence demonstrated the accuracy of the procedure and a precision of ± 3% of the observed results. The use of tracer may be omitted if systematic errors up to 5% are acceptable. Wet-ashing has also been omitted with equally good results but there is an additional risk of error due to possible interference effects by constituents of some pathological samples.

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