TCM-NBD,a novel near-infrared fluorescence probe for detection of H2S in water samples,is designed and synthesized through using 4-hydroxy-phenyl-2-(3,5,5-trimethylcyclohex-2-en-1-yl)propionic nitrile,that is made from 2-(3,5,5-trimethylcyclohex-2-ene-1-yl)propionic nitrile(TCM)and 4-hydroxybenzaldehyde,as fluorescent group and using 7-nitro-1,2,3-benzodizolamine(NBD)as recognition unit.Effects of different pH values on the response of TCM-NBD probe towards H2S are investigated,and the response of TCM-NBD probe to H2S concentration and time,the selectivity and sensitivity of TCM-NBD probe are also explored.The possible response mechanism is speculated.Results show that this TCM-NBD probe can achieve rapid response to H2S(＜10 minutes);Within 0-25 μmol·L-1 H2S concentration range,there are good linear relationships between absorbance or fluorescence intensity and H2S concentration,with correlations of 0.994 7 and 0.992 6,and detection limits of 0.28 µmol·L-1 and 0.84 µmol·L-1,respectively.TCM-NBD probe shows strong anti-interference and high sensitivity,and can be successfully applied to the detection of H2S in environmental water samples.
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