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Colorimetric determination of Hg(II) via the gold amalgam induced deaggregation of gold nanoparticles

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Abstract

A method is described for the colorimetric determination of mercury(II). In the absence of Hg(II), aminopropyltriethoxysilane (APTES) which is positively charged at pH 7 is electrostatically absorbed on the surface of gold nanoparticles (AuNPs). This neutralizes the negative charges of the AuNPs and leads to NP aggregation and a color change from red to blue-purple. However, in the presence of Hg(II), reduced Hg (formed through the reaction between Hg(II) and citrate on the AuNP surface) will replace the APTES on the AuNPs. Hence, the formation of aggregates is suppressed and the color of the solution does not change. The assay is performed by measuring the ratio of absorbances at 650 and 520 nm and can detect Hg(II) at nanomolar levels with a 10 nM limit of detection. The specific affinity between mercury and gold warrants the excellent selectivity for Hg(II) over other environmentally relevant metal ions.

Schematic of the method for determination of Hg2+ based on the gold amalgam-induced deaggregation of gold nanoparticles in the presence of APTES with the LOD of 10.1 nM.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang, 641100, Sichuan, China

    Yonghong Xie

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  1. Yonghong Xie
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Correspondence to Yonghong Xie.

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Xie, Y. Colorimetric determination of Hg(II) via the gold amalgam induced deaggregation of gold nanoparticles. Microchim Acta 185, 351 (2018). https://doi.org/10.1007/s00604-018-2900-9

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  • DOI: https://doi.org/10.1007/s00604-018-2900-9

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