Ion chromatographic determination of calcium and magnesium cations in human saliva and urine with a piezoelectric detector.

In this present paper, simultaneous determination of Ca(2+) and Mg(2+) cations in saliva, urine was achieved using an ion chromatography method, in which a piezoelectric quartz crystal (PQC) sensor was used as a detector, and a solution containing tartaric acid (4 mmol 1(-1)) and ethylenediamine (2 mmol 1(-1)) as a mobile phase. Good linearities were obtained over the ranges of 0.8-500 mg 1(-1) Ca(2+) and 1.0-500 mg 1(-1) Mg(2+). The detection limits were 0.4 mg 1(-1) for Ca and 0.2 mg 1(-1) for Mg, respectively.