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A green solvent-free method for methylene blue quantification in water by dSPE-DRIFTS using MCM-41 mesoporous silica
Pedro Martin1, Sonia Keunchkarian2, Nicolas Fellenz1
1Laboratorio de Materiales Nanoestructurados, Centro de Investigaciones y Transferencia de Río Negro (CONICET/UNRN), Ruta Provincial N°1 y Rotonda Cooperación, Viedma, Río Negro, Argentina.
Summary
A new solvent-free method using dispersive solid-phase extraction and DRIFTS efficiently determines methylene blue (MB) in water. This cost-effective approach is suitable for environmental monitoring of MB contamination.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Methylene blue (MB) is a common water contaminant.
- Accurate and sustainable analytical methods are needed for MB detection.
Purpose of the Study:
- To develop a solvent-free analytical method for MB determination in water.
- To utilize dispersive solid-phase extraction (dSPE) coupled with diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS).
Main Methods:
- Employed mesoporous silica MCM-41 as a sorbent for dSPE.
- Optimized extraction variables (pH, sorbent amount, contact time).
- Utilized DRIFTS for MB quantification.
Main Results:
- Achieved good linearity (R² = 0.997) from 0.5-3.20 mg/L.
- Obtained LOD of 0.2 mg/L and LOQ of 0.5 mg/L.
- Demonstrated reliable quantification down to 0.07 mg/L with sequential loading.
Conclusions:
- The dSPE-DRIFTS method is simple, cost-effective, and environmentally sustainable.
- The method is suitable for routine MB determination in aqueous matrices.
- Successfully applied to real river water samples for environmental monitoring.
