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