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Determination of Ammonium, Sodium, Potassium, Magnesium, and Calcium Cations in Rain Water by Column-Coupling Capillary Isotachophoresis

I. Zelenský, A. Hybenová, and D. Kaniansky

Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University, SK-842 15 Bratislava

 

Abstract: Separation conditions suitable to the isotachophoretic determination of K+, Na+, NH4+, Ca2+, and Mg2+ cations in rain water are described. The use of column-coupling ITP instrument with the electrolyte system enabling a complete resolution of the studied cations provided the limits of detection in the range of 0.4-2.1 μmol dm-3 for a 30 mm3 sample injection volume when the detection was carried out with the aid of a conductivity detector. Rapid (ca. 10 min analysis time) and reproducible determinations (typically 5 % relative standard deviations) were achieved. Recoveries of the analytes in rain water samples on μmol dm-3 concentration levels ranged from 94 to 120 % with the extreme values being typical for the analyte concentrations close to the limits of detection.

Full paper in Portable Document Format: 514a221.pdf

 

Chemical Papers 51 (4) 221–225 (1997)

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