Selective Recognition and Reversible “Turn-Off” Fluorescence Sensing of Acetate (CH3COO?) Anion at Ppb Level Using a Simple Quinizarin Fluorescent Dye

A simple and cost-effective optical sensing system based on quinizarin fluorescent dye (QZ) for the selective reversible of CH3COO? anions is reported. The anion binding affinity QZ towards different was monitored using electronic absorption fluorescence emission titration studies in DMSO. UV-visible spectrum showed a decrease intensity characteristic peaks at ? = 280, 323, 475 nm, while new peak appeared 586 nm after addition anions. Similarly, initial strong attenuated following with Notably, similar other anions, such as F?, Cl?, I?, NO3?, NO2?, H2PO4-, caused no observable changes both spectra. also reflected by sharp visual color change from bright green to faint under room light. Further, found be reversible, this makes potential colorimetric sensor selective, ppb-level detection DMSO medium.