title: Simultaneous ion-exclusion chromatography and cation-exchange chromatography of anions and cations in environmental water samples on a weakly acidic cation-exchange resin by elution with pyridine-2,6-dicarboxylic acid.
abstract: A non-suppressed conductivity detection ion chromatographic method using a weakly acidic cation-exchange column (Tosoh TSKgel OApak-A) was developed for the simultaneous separation and determination of common inorganic anions (Cl-, NO3- and SO4(2-)) and cations (Na+, NH4+, K+, Mg2+ and Ca2+). A satisfactory separation of these anions and cations on the weakly acidic cation-exchange column was achieved in 25 min by elution with a mixture of 1.6 mmol L-1 pyridine-2,6-dicarboxylic acid and 8.0 mmol L-1 18-crown-6 at flow rate of 1.0 mL min-1. On this weakly acidic cation-exchange resin, anions were retained by an ion-exclusion mechanism and cations by a cation-exchange mechanism. The linear range of the peak area calibration curves for all analytes were up to two orders of magnitude. The detection limits calculated at S/N = 3 ranged from 0.25 to 1.9 mumol L-1 for anions and cations. The ion-exclusion chromatography-cation-exchange chromatography method developed in this work was successfully applied to the simultaneous determination of major inorganic anions and cations in rainwater, tap water and snow water samples.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, China. dingmy@chem.tsinghua.edu.cn
authors.forename: M Y
authors.initials: MY
authors.lastname: Ding
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: W
authors.initials: W
authors.lastname: Hu
authors.forename: K
authors.initials: K
authors.lastname: Hasebe
authors.forename: P R
authors.initials: PR
authors.lastname: Haddad
mesh_terms: D002852:Chromatography, Ion Exchange; D007477:Ions / Q000032:analysis*; D011891:Rain; D012914:Snow; D014867:Water / Q000502:physiology*; D014881:Water Supply
chemical_list: D007477:Ions; D014867:Water