Simultaneous separation of common mono- and divalent cations on a zirconium-modified silica gel column by ion chromatography with non-suppressed conductimetric detection and tartaric acid-15-crown-5 as eluent.
The application of laboratory-made zirconium-modified silica gels (Zr-silicas) as cation-exchange stationary phases to ion chromatography with conductimetric detection (IC-CD) for common mono- and divalent cations (Li+, Na+, NH4+, K+, Mg2+ and Ca2+) was carried out. Zr-silicas were prepared by the reaction of the silanol group on the surface of silica gel with zirconium tetrabutoxide (Zr(OCH2CH2CH2CH3)4) in ethanol. Zr-silica adsorbed on 10 mg zirconium g(-1) silica gel was a suitable cation-exchange stationary phase in IC-CD for the separation of these mono- and divalent cations. Excellent simultaneous separation and highly sensitive detection for these cations were achieved in 10 min by IC-CD using a Zr-silica column (150x4.6 mm I.D.) and 10 mM tartaric acid containing 10 mM 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane) as the eluent. The proposed IC-CD method was successfully applied to the determination of major mono- and divalent cations in natural water samples.
Ohta
K
K
National Industrial Research Institute of Nagoya, Aichi, Japan. kazuohta@nirin.go.jp
Morikawa
H
H
Tanaka
K
K
Uwamino
Y
Y
Furukawa
M
M
Sando
M
M
D002413:Cations, Divalent / Q000302:isolation & purification*; D002414:Cations, Monovalent / Q000302:isolation & purification*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D043844:Crown Ethers; D004563:Electrochemistry; D004988:Ethers, Cyclic / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013644:Tartrates / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
D002413:Cations, Divalent; D002414:Cations, Monovalent; D043844:Crown Ethers; D004988:Ethers, Cyclic; D013644:Tartrates; C042148:15-crown-5; D012822:Silicon Dioxide; D015040:Zirconium; C029768:tartaric acid