title: Ion chromatographic separation of hydrogen ion and other common mono- and divalent cations.
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.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, 110 Nishiibara-cho, Seto, Aichi 489-0884, Japan. chemxuqun@yahoo.com
authors.forename: Qun
authors.initials: Q
authors.lastname: Xu
authors.forename: Masanobu
authors.initials: M
authors.lastname: Mori
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Tanaka
authors.forename: Wenzhi
authors.initials: W
authors.lastname: Hu
authors.forename: Paul R
authors.initials: PR
authors.lastname: Haddad
mesh_terms: D002413:Cations, Divalent / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D006859:Hydrogen / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration
chemical_list: D002413:Cations, Divalent; D006859:Hydrogen