title: Analysis of trace inorganic anions in weak acid salts by single pump cycling-column-switching ion chromatography.
abstract: The application of ion chromatography with the single pump cycling-column-switching technique was described for the analysis of trace inorganic anions in weak acid salts within a single run. Due to the hydrogen ions provided by an anion suppressor electrolyzing water, weak acid anions could be transformed into weak acids, existing as molecules, after passing through the suppressor. Therefore, an anion suppressor and ion-exclusion column were adopted to achieve on-line matrix elimination of weak acid anions with high concentration for the analysis of trace inorganic anions in weak acid salts. A series of standard solutions consisting of target anions of various concentrations from 0.005 to 10 mg/L were analyzed, with correlation coefficients r ≥ 0.9990. The limits of detection were in the range of 0.67 to 1.51 μg/L, based on the signal-to-noise ratio of 3 and a 25 μL injection volume. Relative standard deviations for retention time, peak area, and peak height were all less than 2.01%. A spiking study was performed with satisfactory recoveries between 90.3 and 104.4% for all anions. The chromatographic system was successfully applied to the analysis of trace inorganic anions in five weak acid salts.
authors: College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, P. R. China.
authors: Zhongping
authors: Z
authors: Huang
authors: Chengzhu
authors: C
authors: Ni
authors: Zhuyi
authors: Z
authors: Zhu
authors: Zaifa
authors: Z
authors: Pan
authors: Lili
authors: L
authors: Wang
authors: Yan
authors: Y
authors: Zhu
mesh_terms: D000143:Acids / Q000737:chemistry*; D000838:Anions / Q000737:chemistry*; D002852:Chromatography, Ion Exchange; D002951:Citrates / Q000737:chemistry; D005561:Formates / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D057230:Limit of Detection; D015203:Reproducibility of Results; D012492:Salts / Q000737:chemistry*; D059629:Signal-To-Noise Ratio; D019346:Sodium Acetate / Q000737:chemistry; D000077559:Sodium Citrate; D019354:Sodium Lactate / Q000737:chemistry; D013644:Tartrates / Q000737:chemistry; D014867:Water
chemical_list: D000143:Acids; D000838:Anions; D002951:Citrates; D005561:Formates; D012492:Salts; D013644:Tartrates; D014867:Water; C030544:formic acid; D000077559:Sodium Citrate; D019346:Sodium Acetate; D006859:Hydrogen; D019354:Sodium Lactate; C029768:tartaric acid
keywords: Cycling column switching; Inorganic anions; Ion chromatography; Weak acid salts