Abstract
Abstract An ion exchange-inductively coupled plasma emission spectroscopy method was developed to measure free calcium and magnesium concentrations simultaneously in urine under non-trace ion exchange conditions. A single set of standards was sufficient for calibration of a given ion-exchange column over a range of concentrations of sodium, potassium, calcium, and magnesium. Zinc and urea at typical urine levels do not interfere. Analyses of four normal urines showed that from 40 to 66 percent of the calcium and magnesium was present in the free, or non-complexed, form.
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