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

Homa Shafiekhani, Fahimeh Nezam, Shahriyar Bahar

Abstract


This paper affords the development and creation of a sensitive new optical sensor that is quite selective to Hg (II) ion in aqueous solution. The sensing element, the newly synthesized 1-(3-methylpenyl)-3-(2-methoxycarbonylphenyl) triazene, 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 (0.67µg L-1). The optode membrane’s response to Hg (II) is fully reversible and reveals a very good selectivity towards Hg (II) ion over a wide variety of other metal ions in solution. Overall performance characteristics of the sensor are evaluated and it has good reversibility, wide dynamic range, long life span, long-term response stability and high reproducibility. The proposed optical sensor gives proper outcomes in applications including direct determination of Hg (II) ion in environmental real samples.


Keywords


Spectrometry; Optode; Heavy metal; Mercury; Polyvinyl chloride; triazenes

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DOI: http://dx.doi.org/10.2298/JSC160520093S

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