Journal of Guangxi Normal University(Natural Science Edition) ›› 2022, Vol. 40 ›› Issue (2): 140-148.doi: 10.16088/j.issn.1001-6600.2021041901

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A New Strategy for the Determination of Trace Mercury by Resonance Rayleigh Scattering Method Based on Nano-gold Catalytic Amplification and Galvanic Replacement Reaction-phosphomolybdic Acid

LIU Qiwen1,2, LI Dan1,2, HUANG Xiaofang1,2, LIANG Aihui1,2*, JIANG Zhiliang1,2*   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006, China;
    2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology (Guangxi Normal University), Guilin Guangxi 541006, China
  • Received:2021-04-19 Revised:2021-04-29 Published:2022-05-31

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Abstract: Phosphomolybdic acid particles have a resonance Rayleigh scattering (RRS) effect, which produces a RRS peak at 450 nm. In the HCOOH-HCOONa buffer solution at pH=3.1, gold nanoparticles (AuNPs) can catalyze the reaction of phosphomolybdic acid-formic acid to produce phosphomolybdenum blue, making the RRS intensity of phosphomolybdic acid linearly decrease at 450 nm. Hg2+ can undergo a galvanic replacement reaction with AuNPs, thereby inhibiting the catalytic effect of AuNPs. In the range of 2.5×10-4-3.5 μmol/L, as the concentration of Hg2+ increases, the catalytic effect of AuNPs gradually weakens, the color of the reaction solution gradually changed from blue to colorless, and the resonance Rayleigh scattering peak of the system at 450 nm increases linearly. The regression equation is ΔI=0.32C+46.1, and the detection limit is 0.18 nmol/L. This method is used for the detection of Hg2+ in wastewater, and the results are satisfactory.

Key words: mercury, nano-gold catalytic, galvanic replacement, phosphorus molybdenum blue, resonance Rayleigh scattering

CLC Number: 

  • O657.3
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