New optical sensor based on the immobilization of a triazene ligand in PVC membrane for Hg(II) ion

• Main Authors: Shafiekhani Homa, Nezam Fahimeh, Bahar Shahriyar
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2017-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: spectrometry; optode; heavy metal; mercury; poly(vinyl chloride); triazenes
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2017/0352-51391600093S.pdf

This paper describes the development and creation of a new sensitive optical sensor that is quite selective to Hg(II) ions in aqueous solution. The sensing element, the newly synthesized methyl 2-[3-(3-methylphenyl)-2-triazen- 1-yl]benzoate, incorporated into a plasticized poly(vinyl chloride) membrane, is able to determine Hg(II) ion with a high selectivity over a wide dynamic range from 5.0–115.1 μg L-1 at pH 7.5 with a lower detection limit of 0.67 μg L-1. The response of the optode membrane to Hg(II) was fully reversible and revealed a very good selectivity towards Hg(II) ion from a wide variety of other metal ions in solution. The overall performance characteristics of the sensor were evaluated and good reversibility, wide dynamic range, long life span, long-term response stability and high reproducibility were found. The proposed optical sensor gives proper results in applications including direct determination of the Hg(II) ion in real environmental samples.