Ion chromatographic separation of hydrogen ion and other common mono- and divalent cations |
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Authors: | Xu Qun Mori Masanobu Tanaka Kazuhiko Hu Wenzhi Haddad Paul R |
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Affiliation: | National Institute of Advanced Industrial Science and Technology, 110 Nishiibara-cho, Seto, Aichi 489-0884, Japan. chemxuqun@yahoo.com |
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Abstract: | We introduced an approach to the ion chromatographic determination of common mono- and divalent cations including hydrogen ion and demonstrated the ability of a C30 column dynamically coated first with dodecylsulfate and then with 18-crown-6 ether to separate the cations by ion-exchange mechanism. Using an ethylenediamine solution containing a small concentration of 18-crown-6 ether and lithium dodecylsulfate at pH 6.2 as eluent, the cations were eluted in the order Li < Na+ < NH4+ < H+ < K+ < Mg2+ < Ca2+ with symmetrical peaks. The conductivity vs. concentration plots were linear about three orders of magnitude, from millimolar to micromolar; and the detection limits were all < 0.6 microM. Rainwater was analyzed directly using this ion chromatographic system with satisfactory results. |
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Keywords: | Water analysis Stationary phases, LC Rainwater Acidity Cations |
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