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Device to generate high purity hydroxide solution in-line for ion chromatography
Hiroto Masunaga1, Yuji Higo1, Mizuo Ishii1
1Nichiri Mfg. Co., Ltd., 324-5, Takatu, Yachiyo, Chiba 276-0036, Japan.
Journal of Chromatography. A
|April 12, 2016
Summary
A novel device generates high-purity hydroxide solutions in line using ion exchange membranes and resins. This technology improves anion chromatography by reducing baseline noise and achieving sub-ng/mL detection limits for anions.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Separation Science
Background:
- High-purity hydroxide solutions are crucial for sensitive analytical techniques.
- Existing methods for hydroxide generation can introduce impurities and gases.
- Suppressed anion chromatography requires stable eluents for optimal performance.
Purpose of the Study:
- To develop and present a new device for in-line generation of high-purity hydroxide solutions.
- To demonstrate the device's capability in producing hydroxide solutions free from gases and anionic impurities.
- To evaluate the device's performance in suppressed anion chromatography for enhanced anion detection.
Main Methods:
- A three-compartment device utilizing cation exchange (CE) membranes and ion exchange resins was designed.
- Electrodes were installed at each end, and bipolar boundaries were employed to separate hydroxide generation from water electrolysis.
- The device's performance was assessed by controlling sodium hydroxide (NaOH) concentration via electrical current and its application in suppressed anion chromatography.
Main Results:
- The device successfully generated high-purity hydroxide solutions in line, free from gases and anionic impurities.
- NaOH concentration was precisely controlled from 0.01 to 100mM/mL/min by adjusting electrical current (0-200mA).
- Utilizing the generated solution as an eluent in suppressed anion chromatography resulted in effluent conductivity comparable to ultra-pure water, significantly improving baseline stability.
Conclusions:
- The developed device offers a reliable method for generating high-purity hydroxide solutions on demand.
- The application in suppressed anion chromatography leads to reduced baseline noise and enhanced detection limits for anions, reaching the sub-ng/mL order.
- This technology holds significant potential for improving the sensitivity and accuracy of anion analysis in various scientific fields.
Keywords:
Anion analysisElectrokinetic phenomenonGeneration of hydroxide solutionIon chromatographyTwo bipolar boundariesMore Related Videos
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