title: Simultaneous determination of six cations in mineral water by single-column ion chromatography.
abstract: The analytical conditions for the simultaneous determination of Li+, Na+, K+, NH4+, Mg2+ and Ca2+ by ion chromatography using a Waters IC-PAK CM/D column were optimised with respect to flow-rate and eluents. Optimum separation of the cations was achieved using 5 mM HNO3 + 0.1 mM EDTA with a flow-rate of 0.6 ml/min and an analytical run time of 8 min. The results of the analysis of cations in seventeen commercially available South Korean bottled waters are presented. Although there is a reference value for drinking water quality in South Korea of 0.5 ppm, the concentration of NH4+ in the water analysed was in the range 0.3-3.0 ppm.
authors.affiliation: Department of Chemistry, Jeonju University, South Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Kim
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000641:Ammonia / Q000032:analysis; D002118:Calcium / Q000032:analysis; D002138:Calibration; D002412:Cations / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods*; D007723:Korea; D016014:Linear Models; D008094:Lithium / Q000032:analysis; D008274:Magnesium / Q000032:analysis; D008900:Mineral Waters / Q000032:analysis*; D011188:Potassium / Q000032:analysis; D012964:Sodium / Q000032:analysis
chemical_list: D002412:Cations; D008900:Mineral Waters; D000641:Ammonia; D008094:Lithium; D012964:Sodium; D008274:Magnesium; D011188:Potassium; D002118:Calcium