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A novel pH optical sensor using methyl orange based on triacetylcellulose membranes as support
Mohammad Hosseini1, Rouhollah Heydari2, Mohammad Alimoradi1
1Department of Chemistry, Faculty of Sciences, Islamic Azad University, Arak Branch, Arak, Iran.
Summary
A new optical pH sensor using methyl orange immobilized on triacetylcellulose offers precise, on-line monitoring. This cost-effective sensor is sensitive and selective across a wide pH range.
Area of Science:
- Analytical Chemistry
- Materials Science
Background:
- Accurate pH monitoring is crucial in various scientific and industrial applications.
- Existing methods may be time-consuming, expensive, or lack on-line capabilities.
Purpose of the Study:
- To develop a novel, cost-effective optical pH sensor for on-line monitoring.
- To immobilize methyl orange indicator onto a triacetylcellulose membrane for enhanced stability and performance.
Main Methods:
- Immobilization of methyl orange indicator onto a triacetylcellulose membrane.
- Fabrication of an optical sensor integrated into a flow cell for continuous monitoring.
- Optimization of variables including dye bonding pH and concentration.
Main Results:
- The developed optical sensor demonstrated good calibration behavior and high precision (RSD < 0.4%).
- The sensor exhibited reliable performance in the pH range of 4.0-12.0.
- Sensor response remained stable across varying ionic strengths (0.0-0.5M NaCl).
Conclusions:
- The triacetylcellulose-supported methyl orange optical sensor provides a sensitive, selective, and rapid method for on-line pH determination.
- This approach offers an inexpensive and effective alternative for continuous pH monitoring in diverse applications.
