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A Highly Current-Efficient Electrodialytic Membrane Suppressor for Ion Chromatography
Jie Zhang1, Weiqing Chen1, Feifang Zhang1
1Engineering Research Center of Pharmaceutical Process Chemistry, Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
Analytical Chemistry
|December 5, 2025
Summary
This study introduces a highly current-efficient electrodialytic membrane suppressor (EMS) for ion chromatography. It achieves 100% current efficiency for hydroxide eluents, enabling effective suppression even at high concentrations.
Area of Science:
- Analytical Chemistry
- Separation Science
Background:
- Ion chromatography commonly uses suppressors to reduce eluent conductivity.
- Electrodialytic membrane suppressors (EMS) offer a promising alternative for efficient suppression.
Purpose of the Study:
- To develop and characterize a novel, highly current-efficient electrodialytic membrane suppressor (EMS) for ion chromatography.
- To evaluate the performance of the EMS with hydroxide eluents at various concentrations and flow rates.
Main Methods:
- A sandwich-like EMS configuration with cation exchange membranes (CEMs) and sulfonated functionalized screens was designed.
- The EMS was tested for current efficiency and background conductivity suppression using potassium hydroxide (KOH) eluents.
Main Results:
- The developed EMS achieved 100% current efficiency with common hydroxide eluents.
- Effective suppression of 10-20 mM KOH eluent to <1 μS/cm background conductivity was demonstrated at 1 mL/min flow rate.
- The suppressor successfully accommodated eluent concentrations up to 80 mM KOH.
Conclusions:
- The novel EMS design significantly enhances current efficiency for ion chromatography.
- This technology provides effective and robust suppression for hydroxide eluents, improving analytical performance.
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