(a) Optical changes in fluorescence emission of several anion solutions after reacting with TBDPSC at 25°C for 1 h; (b) Comparison of fluorescence intensity values of several anion solutions after reacting with TBDPSC at 25 °C for 1 h. Tested samples were excited by UV light at 360 nm and emission intensities were measured at 460 nm. Left to right: DI water, F−, Cl−, Br−, I−, NO3−, View the MathML sourceSO42− and CH3 COO−.