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

An optrode for Hg2+ ions based on a Nafion-1-(2-thiazolylazo)-2-naphtol (TA N) composite thin film has been developed. This optrode has a wide linear r esponse range of 1-75 mu M (pH 6) of Hg2+ ions with a limit of detection of 0.05 mu M (10 mu g l(-1)), which is sufficiently adequate for many environ mental monitoring applications. The reflectance signal response shows a clo se 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, dep ending 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 int erferences.