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Citation: CAI Yu-Ling, ZHANG Ji-Mei. Synthesis and Application of Gold Nanoclusters for Detection of Heavy Metal Mercury Ions[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(6): 952-959. doi: 10.11895/j.issn.0253-3820.171540 shu

Synthesis and Application of Gold Nanoclusters for Detection of Heavy Metal Mercury Ions

School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China

Received Date: 31 December 2017
Revised Date: 8 April 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21106101)

A colorimetric method was developed for detection of mercury based on the inhibition of oxidation of peroxidase substrates. The as-prepared gold nanoclusters (Au NCs), which has been stabilized and reduced by Glutathione (GSH), can effectively catalyze the H₂O₂-TMB to generate a blue color signal. It is interestingly that Hg²⁺ can inhibit the oxidation of peroxidase substrates, thus causing a color diminished. Taking advantage of the inhibitive effect of Hg²⁺, a novel Hg²⁺ sensor has been developed. In this system, sensing conditions, including pH of the buffer solution, substrate concentration and time, were optimized. Under the optimal conditions, the probe showed a linear range of 10-300 nmol/L (R²=0.997) with a detection limit of 6.26 nmol/L. In addition, this sensor exhibited good selectivity and sensitivity for Hg²⁺ against other common environmental mental ions, providing a new method for water analysis.
- Gold nanoclusters,
- Peroxidase-like activity,
- Colorimetric,
- Mercury ion
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