Design and characteristics of a sulfide and sulfite optode based on immobilization of methyl violet on a triacetylcellulose membrane

The characterization of an optical sensor membrane is described for the determination of sulfite and sulfide ions based on the immobilization of methyl violet on a triacetylcellulose membrane. Methyl violet is covalently bonded to a transparent triacetylcellulose film. The absorbance of the membranes decreased by increasing sulfite and sulfide concentration. This optode has a linear range of 0.375–8.75 mmol L−1 (30–700 μg mL−1) and 0.156–18.75 mmol L−1 (5–600 μg mL−1) for sulfite and sulfide ions, respectively, at 598 nm. The response time of optode is within 0–3 min depending on the concentration of sulfite and sulfide ions. The sensor can readily be regenerated with water. The sensor could be fully regenerated, and the color is fully reversible. The sensor was successfully used to the determination of sulfide in water and determination of sulfite in water and fruit juice samples.