A chromatographic approach for fluorescence reduction in liquid Raman analysis

Area of Science:

• Analytical Chemistry
• Spectroscopy

Background:

• Fluorescence interference complicates quantitative and qualitative analysis in liquid Raman spectroscopy.
• Separating fluorescing compounds from analytes is crucial for accurate Raman measurements.

Purpose of the Study:

• To evaluate a chromatographic approach for fluorescence reduction in liquid Raman analysis.
• To assess the effectiveness of real-time chemical pretreatment for Raman spectroscopy.

Main Methods:

• Utilized a liquid-core Raman waveguide detector designed for chromatographic applications.
• Analyzed twenty aqueous mixtures of common beverage additives.
• Compared results with and without chromatographic separation, and with a conventional immersion probe.

Main Results:

• The chromatographic Raman approach yielded satisfying qualitative and quantitative results.
• Demonstrated superior quantitative and qualitative assessment capabilities compared to other setups.
• Showcased potential for enhanced sensitivity in Raman analysis.

Conclusions:

• The chromatographic method effectively reduces fluorescence, enhancing Raman analysis.
• This simple, inexpensive technique is readily implementable in applied Raman laboratories.
• Further studies are needed to confirm general applicability across diverse chemical systems and assess long-term stability.