Characterisation of a Hg(II) ion optrode based on Nafion®-1-(2-thiazolylazo)-2-naphthol composite thin films
- 1 January 1999
- journal article
- research article
- Published by Royal Society of Chemistry (RSC)
- Vol. 1 (1) , 109-114
- https://doi.org/10.1039/a807607c
Abstract
An optrode for Hg 2+ 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 Hg 2+ 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 Hg 2+ ions. The selectivity of optrode to Hg 2+ ions in phosphate buffer is good, with Co 2+ and Ni 2+ ions as the main interferences.Keywords
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