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A simultaneous determination method of alkaline earth metals was attempted with the conventional high performance liquid chromatographic system. Four cations, namely, magnesium, calcium, strontium and barium ion, were injected directly as aqueous solution into an eluent containing copper chloride solution and were successfully separated and determined on a separating column (Zipax SCX, 4.6 mm i.d. x 25cm length, Du Pont, USA) by using a variable wavelength UV detector. The linear calibration curves were obtained in the range from 1.0 x 10-4M to 5.0 x 10-4 M and the correlation coefficient of the calibration curve for each metal was in the range of 0.9952 ~ 0.9996. The proposed method was applied to the determination of magnesium and calcium in tap water. Alkaline earth metals were determined with the conventional high performance liquid chromatographic system.
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