Dual-Function Fluorescent Probe for Detection of Hydrogen Sulfide and Water Content in Dimethyl Sulfoxide

To detect hydrogen sulfide (H₂S) and water content in dimethyl sulfoxide, the fluorescent probe (Probe 1) was used, as it not only detects H₂S but also detects the water content. After H₂S was added into Probe 1, the intensity of fluorescence increased and was up to 1300 times. In case the H₂S concentration was in the range 0-20 μM, it was able to be detected by Probe 1, and the limit of detection was 0.851 nM. When Probe 1 and H₂S underwent a reaction, the solution color had some changes. These colors changed in terms of the concentration changes of H₂S, ranging from colorless to yellow. The Probe 1 test paper only needed to be exposed to hydrogen sulfide gas for 20 s for the color change to occur. Besides, Probe 1-H₂S was used to detect water content in dimethyl sulfoxide which ranged from 0 to 100%. The color change of the solution was opposite to that of H₂S, ranging from yellow to colorless.