Strategic Approaches for Highly Selective and Sensitive Detection of Hg<sup>2+</sup> Ion Using Mass Sensitive Sensors

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  • PARK Hyeoun Ji
    Department of Pharmaceutical Engineering, Soonchunhyang University
  • LEE Soo Suk
    Department of Pharmaceutical Engineering, Soonchunhyang University

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  • Strategic Approaches for Highly Selective and Sensitive Detection of Hg²⁺ Ion Using Mass Sensitive Sensors

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Abstract

<p>Here we present a quartz crystal microbalance (QCM) sensor for the highly selective and sensitive detection of Hg2+ ion, a toxic chemical species and a hazardous environmental contaminant. Hg2+ ion can be quantitatively measured based on changes in the resonance frequency of QCM following mass changes on the QCM sensor surface. The high selectivity for Hg2+ ion in this study can be obtained using a thymine–Hg2+–thymine pair, which is more stable than the adenine-thymine base pair in DNA. On the other hand, gold nanoparticles (AuNPs) and their size-enhancement techniques were used to amplify the QCM signals to increase the sensitivity for Hg2+ ion. With this strategic approach, the proposed QCM sensor can be used to quantitatively analyze Hg2+ ion with high selectivity and sensitivity. The detection limit was as low as 98.7 pM. The sensor failed to work with other metal ions at concentrations 1000-times higher than that of the Hg2+ ion. Finally, the recovery does not exceed 10% of the original value for the detection of Hg2+ ion in tap and bottled water. The results indicate acceptable accuracy and precision for practical applications.</p>

Journal

  • Analytical Sciences

    Analytical Sciences 35 (8), 883-888, 2019-08-10

    The Japan Society for Analytical Chemistry

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