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Raman Spectroscopy of Disperse Systems with Varying Particle Sizes and Correction of Signal Losses
Erik Spoor1, Viktoria Oerke1, Matthias Rädle1
1CeMOS Research and Transfer Center, Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, 68163 Mannheim, Germany.
Sensors (Basel, Switzerland)
|May 25, 2024
Summary
This study corrects Raman spectroscopy signal loss in glass bead dispersions. A scattered light measurement accurately adjusts ammonium nitrate concentration readings for improved analysis.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Background:
- Raman spectroscopy is a powerful tool for chemical analysis.
- Dispersions, like glass beads in solutions, can cause signal interference.
- Accurate quantification of ammonium nitrate concentration is crucial in various industrial processes.
Purpose of the Study:
- To develop a method for correcting Raman spectroscopy signal loss in glass bead dispersions.
- To improve the accuracy of ammonium nitrate concentration measurements in challenging samples.
- To enable process analytical technology for previously difficult-to-measure dispersions.
Main Methods:
- Investigated glass bead dispersions (2-99 µm) in ammonium nitrate solutions (0-20 wt%) using Raman spectroscopy.
- Quantified signal losses using a scattered light measurement.
- Developed a correction function based on scattered light data and particle size.
Main Results:
- Scattered light measurements effectively correlate with Raman signal loss.
- The developed correction function accurately adjusts ammonium nitrate concentration.
- Achieved a Root Mean Square Error of Prediction (RMSEP) of 1.952 wt% for corrected concentrations.
Conclusions:
- Scattered light measurement is a viable method to correct Raman signal attenuation in dispersions.
- The developed correction method enhances the applicability of Raman spectroscopy for analyzing complex dispersions.
- This facilitates easier process access and more reliable measurements in industrial settings.
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