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• W1992956339 abstract "The elution profile of chromatographic peaks provides fundamental understanding of the processes that occur in the mobile phase and the stationary phase. Major advances have been made in the column chemistry and suppressor technology in ion chromatography (IC) to handle a variety of sample matrices and ions. However, if the samples contain high concentrations of matrix ions, the overloaded peak elution profile is distorted. Consequently, the trace peaks shift their positions in the chromatogram in a manner that depends on the peak shape of the overloading analyte. In this work, the peak shapes in IC are examined from a fundamental perspective. Three commercial IC columns AS16, AS18, and AS23 were studied with borate, hydroxide and carbonate as suppressible eluents. Monovalent ions (chloride, bromide, and nitrate) are used as model analytes under analytical (0.1 mM) to overload conditions (10–500 mM). Both peak fronting and tailing are observed. On the basis of competitive Langmuir isotherms, if the eluent anion is more strongly retained than the analyte ion on an ion exchanger, the analyte peak is fronting. If the eluent is more weakly retained on the stationary phase, the analyte peak always tails under overload conditions regardless of the stationary phase capacity. If the charge of the analyte and eluent anions are different (e.g., Br– vs CO32–), the analyte peak shapes depend on the eluent concentration in a more complex pattern. It was shown that there are interesting similarities with peak distortions due to strongly retained mobile phase components in other modes of liquid chromatography." @default.
• W1992956339 created "2016-06-24" @default.
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• W1992956339 date "2013-12-23" @default.
• W1992956339 modified "2023-10-16" @default.
• W1992956339 title "Peak Distortion Effects in Analytical Ion Chromatography" @default.
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• W1992956339 doi "https://doi.org/10.1021/ac402624a" @default.
• W1992956339 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24328391" @default.
• W1992956339 hasPublicationYear "2013" @default.
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