Abstract
The authors report that sulfide ions are capable of inhibiting the peroxidase-like activity of copper nanoclusters (CuNCs). The catalytic activity of CuNCs toward the oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine by H2O2 is remarkably decreased in the presence of sulfide. Based on this finding, a colorimetric assay was developed for the rapid determination of sulfide. Best operated at a wavelength of 652 nm, it has a 0.5 μM detection limit. The method is highly selective and has been successfully applied to the quantification of sulfide in environmental water samples.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC, 21605012), Scientific and Technological Research Program of Chongqing Municipal Education Commission (No. KJ1600301), and the Program for Top-Notch Young Innovative Talents of Chongqing Normal University (No. 02030307-00043).
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Liao, H., Hu, L., Zhang, Y. et al. A highly selective colorimetric sulfide assay based on the inhibition of the peroxidase-like activity of copper nanoclusters. Microchim Acta 185, 143 (2018). https://doi.org/10.1007/s00604-018-2701-1
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DOI: https://doi.org/10.1007/s00604-018-2701-1