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DOI: 10.1039/A807607C (Paper) Reference Section for: J. Environ. Monit., 1999, 1, 109-114

Characterisation of a Hg(II) ion optrode based on Nafion®-1-(2-thiazolylazo)-2-naphthol composite thin films

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Bambang Kuswandi and Ramaier Narayanaswamy

Abstract

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 μM (pH 6) of Hg2+ ions with a limit of detection of 0.05 μM (10 μg 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.

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