Journal
ANALYTICAL CHEMISTRY
Volume 87, Issue 17, Pages 8673-8678Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.5b01130
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Funding
- Australian Research Council Future Fellowship [FT130100101]
- Australian Research Council Australian Research Fellowship [DP110104923]
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A comprehensively coupled online two-dimensional ion chromatography-capillary electrophoresis (IC x CE) system for quantitative analysis of inorganic anions and organic acids in water is introduced. The system employs an in-house built sequential injection-capillary electrophoresis instrument and a nonfocusing modulation interface comprising a tee-piece and a six-port two-position injection valve that allows comprehensive sampling of the IC effluent. High field strength (+2 kV/cm) enables rapid second-dimension separations in which each peak eluted from the first-dimension separation column is analyzed at least three times in the second dimension. The IC x CE approach has been successfully used to resolve a suite of haloacetic acids, dalapon, and common inorganic anions. Two-dimensional peak capacity for IC x CE was 498 with a peak production rate of 9 peaks/min. Linear calibration curves were obtained for all analytes from 5 to 225 ng/mL (except dibromoacetic acid (10-225 ng/mL) and tribromoacetic acid (25-225 ng/mL)). The developed approach was used to analyze a spiked tap water sample, with good measured recoveries (69-119%).
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