A Distinct Anion Separation Approach via Isocratic Liquid Chromatography Coupled with Vacuum Ultraviolet Detection.

Area of Science:

• Analytical Chemistry
• Chromatography
• Spectroscopy

Background:

• Ion chromatography is crucial for analyzing anions in various matrices.
• Traditional detection methods for anions can be limited.
• Developing robust separation methods for a wide range of anions is essential.

Purpose of the Study:

• To develop and optimize non-suppressed ion chromatography methods for separating 36 common inorganic and organic anions.
• To evaluate the suitability of cyclofructan-based stationary phases and hydrophilic interaction liquid chromatography (HILIC) mode.
• To assess the performance of vacuum ultraviolet (VUV) detection for anion analysis.

Main Methods:

• Utilized non-suppressed ion chromatography with uncharged cyclofructan-based stationary phases.
• Employed mobile phases with varying ratios of acetonitrile and perchlorate salts in water.
• Implemented hydrophilic interaction liquid chromatography (HILIC) mode for separation.
• Employed novel vacuum ultraviolet (VUV) detection for enhanced anion detection.

Main Results:

• Successfully separated 36 common inorganic and organic anions.
• Achieved optimal separations in HILIC mode using specific mobile phase compositions.
• Demonstrated the effectiveness of VUV detection for anions, including those with low UV absorbance.
• Showcased the ability to modulate retention using different perchlorate salts (potassium and lithium) for electrostatic selectivity.

Conclusions:

• Developed a versatile non-suppressed ion chromatography method for comprehensive anion analysis.
• Vacuum ultraviolet (VUV) detection offers a powerful, non-destructive alternative for anion detection in liquid chromatography.
• The combination of HILIC, cyclofructan phases, and VUV detection provides a robust platform for challenging anion separations.