LAUSR

ABSTRACT The colorimetric-fluorescent sensor ASHTI, synthesized by simple method, could sensitively and selectively sense bisulfite (HSO3−) in phosphate-buffered saline solution (pH 7.4) via the Michael-addition mechanism. ASHTI with D -π-A structure emitted red fluorescence, which could minimize the background noises and increase signal-to-noise ratio. It showed higher selectivity to HSO3− than other anions and cations, and the low detection limit was 0.27 µM. Also, 1H NMR and LC-MS spectra were employed to confirm its sensing mechanism. The simple, quick, and convenient ASHTI test strips were prepared. And the naked eye could easily observe that the red color of these test strips gradually faded with increasing the concentration of HSO3−. Then ASHTI test strips were used for detecting HSO3− in river water and paddy water successfully. Also, ASHTI solution was applied to fluorescence sense HSO3− in paddy water, river water, lake water, and tap water with satisfactory results. All these results demonstrated that ASHTI could be applied for the initial screening of environmental samples containing HSO3− and accurately analyze the HSO3− content in environment field.