The synthesis and development of a dual-analyte colorimetric sensor: Simultaneous estimation of Hg2+ and Fe3+
摘要:
The selectivity and sensitivity of a pH stable hetarylazo dye equipped with binding sites consisting of N S and N 0 combinations towards Hg2+ and Fe3+ over a large number of other cations including lanthanides is described Hg2+ and Fe3+ ions coordinate to the dye through N S binding site forming 2 1 and 1 1 complexes respectively Distinct naked-eye color changes for both Hg2+ (yellow to purple) and Fe3+ (yellow to red) were quantified for simultaneous estimation of these ions To further establish the binding and sensing phenomenon another analogous hetarylazo dye lacking N 0 combination was evaluated and found to give similar results For practical applicability in routine life very handy and ready-to-use paper strips coated with the dye have been prepared for the detection of Hg2+ just like the pH paper strips (C) 2010 Elsevier Ltd All rights reserved