Abstract
A simple method of complexiometric determination of magnesium is described. The titration of calcium and magnesium subsequently in one procedure is arranged by changing the indicator. The colour change of the indicator is read with a photometer. In a serial determination with an uniform serum pool the standard deviation of the mean was 1.91 ± 0.01 mg/100 ml. This means a deviation of ± 0.6%. Compared with other methods these differences are rather small. Iron and copper are not disturbing in the tested concentrations up to 1.5 mg/100 ml. The normal value in 24 healthy persons of various ages was 1.71 ± 0.11 mequiv/1. For the preparation of standard solutions metallic magnesium and magnesium ammonium phosphate were especially useful, readings with magnesium oxide were too low.
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