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A novel gas-free potassium hydroxide eluent generator (EG) for open tubular ion chromatography offers stable, reproducible gradient elution. This device achieves high performance with minimal internal volume and low back pressure.

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Traditional ion chromatography often relies on eluents that can generate gas, complicating system operation.
  • Open tubular systems require precise eluent generation for optimal performance.

Purpose of the Study:

  • To develop and characterize a gas-free potassium hydroxide eluent generator (EG) for open tubular ion chromatography.
  • To evaluate the performance of the EG in terms of linearity, stability, and reproducibility.

Main Methods:

  • A two-membrane configuration featuring cation exchange membrane (CEM) and bipolar membrane (BPM) layers was employed.
  • The EG was integrated into an open tubular ion chromatography system with back pressures below 50 psi.
  • Performance was assessed by measuring gradient rise time, linearity of KOH generation, and system reproducibility via retention time RSD.

Main Results:

  • The gas-free EG demonstrated a 210 nL internal volume and achieved a 3.5 min gradient rise time at ~190 nL/min flow rate.
  • Excellent linearity was observed between applied current and generated KOH concentration, with stable output over time.
  • System reproducibility was high, with relative standard deviations (RSD) for retention times <0.5% (isocratic) and <1.2% (gradient).
  • KOH production was observed at subelectrolytic voltages, linked to field-enhanced water dissociation at field strengths of 10^5 V/m.

Conclusions:

  • The developed gas-free EG is suitable for open tubular ion chromatography, providing stable and reproducible eluent generation.
  • The device's performance, including linearity and reproducibility, meets the demands of advanced chromatographic separations.
  • The findings suggest a mechanism involving field-enhanced water dissociation contributing to eluent generation at lower voltages.