Analysis of trace inorganic anions in weak acid salts by single pump cycling-column-switching ion chromatography

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 trans...

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Bibliographic Details
Published in:Journal of separation science 2015-05, Vol.38 (8), p.1294-1300
Main Authors: Huang, Zhongping, Ni, Chengzhu, Zhu, Zhuyi, Pan, Zaifa, Wang, Lili, Zhu, Yan
Format: Article
Language:English
Subjects:
Acids
Acids - chemistry
Anions
Anions - chemistry
Chromatography
Chromatography, Ion Exchange
Citrates - chemistry
Cycling column switching
Formates - chemistry
Hydrogen - chemistry
Hydrogen ions
Inorganic anions
Ion chromatography
Limit of Detection
On-line systems
Pumps
Reproducibility of Results
Salts - chemistry
Signal-To-Noise Ratio
Sodium Acetate - chemistry
Sodium Lactate - chemistry
Spiking
Standard deviation
Suppressors
Tartrates - chemistry
Water
Weak acid salts
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Summary: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.
ISSN:1615-9306
1615-9314
DOI:10.1002/jssc.201401366