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Updated: Mar 1, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
Electrodialytic eluent generators for ion chromatography: A comprehensive review
Miao Zhang1, Haiyan Li1, Yang Liu1
1MOE Key Laboratory of Groundwater Quality and Health, School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
None:
The electrodialytic eluent generator (EDG) employs electric field-driven ion migration and current programming to generate eluents of precisely controllable concentration online, using water as the carrier phase. It represents a key enabling technology for advancing ion chromatography toward greater automation and reduced reagent consumption. This paper presents a comprehensive discussion of EDG structural designs and operating principles, summarizes representative technical approaches, and establishes a reference framework for performance evaluation. Key parameters analyzed include current-controlled concentration behavior, faradaic efficiency, suppressed product conductivity, zero-current penetration, and gradient response. Furthermore, through comparison of membrane and compartment configurations as well as ion delivery pathways, representative schemes, namely Type 1, Type 2, bipolar boundary, and bipolar membrane configurations, are examined. Online eluent generation strategies based on alkaline, acidic, and carbonate/mixed systems are systematically reviewed, alongside recent progress in system integration, including miniaturisation, high-pressure compatibility, and generation-suppression coupling. This work provides theoretical foundations and practical references for structural selection, performance optimisation, and integrated system design of EDGs.
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