Characterisation of a Hg(II) ion optrode based on Nafion-1-(2-thiazolylazo)-2-naphthol composite thin films.
An optrode for Hg2+ ions based on a Nafion-1-(2-thiazolylazo)-2-naphtol (TAN) composite thin film has been developed. This optrode has a wide linear response range of 1-75 microM (pH 6) of Hg2+ ions with a limit of detection of 0.05 microM (10 micrograms l-1), which is sufficiently adequate for many environmental monitoring applications. The reflectance signal response shows a close correlation with the theoretical model derived. The response time of the optrode thin film was within 5-7 min to reach 95% of the final signal, depending on the concentration of Hg2+ ions. The selectivity of optrode to Hg2+ ions in phosphate buffer is good, with Co2+ and Ni2+ ions as the main interferences.
Kuswandi
B
B
Department of Instrumentation and Analytical Science, UMIST, PO Box 88, Manchester, UK M60 1QD.
Narayanaswamy
R
R
D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D005465:Fluorocarbon Polymers / Q000737:chemistry; D007477:Ions; D017669:Mercury Compounds / Q000032:analysis*; D055095:Optics and Photonics; D012680:Sensitivity and Specificity
D005465:Fluorocarbon Polymers; D007477:Ions; D017669:Mercury Compounds; C040402:perfluorosulfonic acid