title: Anion chromatography using on-line recycled eluents.
abstract: Non-suppressed anion chromatography, using on-line recycled eluents, was investigated. Cations and anions from samples were excluded from the eluents using a mixture of strongly acidic cation-exchange resins and strongly basic anion exchange resins in the eluent reservoir. This exclusion was performed after determination of the anions in the non-suppressed anion chromatography, and the eluents were then recycled on-line. The performance of consecutive determinations was evaluated from the relative standard deviation (RSD) of peak heights and retention times of chloride, bromide, nitrite, nitrate, and sulfate ions, with a concentration of 3 microg ml(-1) each, compared to that of normal anion chromatography. Over 50 consecutive determinations could be achieved with an eluent volume of only 200 ml for a 100 microl sample volume. Almost all the RSD values for retention time, and peak heights of these anions, were smaller than 3%. Over fifty consecutive determinations of chloride, nitrate, and sulfate ions in a river water sample could be achieved with an eluent volume of only 100 ml. All the RSD values for retention time and peak heights of these anions were smaller than 3%. The eluent volume could be decreased to one tenth of that used in normal anion chromatography. The performance of the anion chromatography, using on-line recycled eluents, was the same as that for normal anion chromatography under the same conditions.
authors.affiliation: Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan. tyokoyam@chem.ous.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yokoyama
authors.forename: Hitoe
authors.initials: H
authors.lastname: Maekubo
authors.forename: Asami
authors.initials: A
authors.lastname: Sakai
authors.forename: Michio
authors.initials: M
authors.lastname: Zenki
mesh_terms: D000838:Anions; D002852:Chromatography, Ion Exchange / Q000379:methods*; D015203:Reproducibility of Results
chemical_list: D000838:Anions