Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 205, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2021.111846
Keywords
Gold; silver alloy nanocomposites (Au; Ag NCs); Colorimetry; Mercury(II) ion (Hg2+); Spectrophotometric; Absorption ratio
Funding
- National Natural Science Foundation of China [52072113, 61505049]
- Doctoral Fund of Henan Polytechnic University [B2013-044, B2013-013]
- Research Projects of Science and Technology of the Education Department Henan Province [14B430026]
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A simple and rapid colorimetric assay for determination of mercury(II) ion in aqueous solutions was developed based on aggregation of gold/silver alloy nanocomposites. The method showed high specificity for Hg2+ and a low detection limit, with no interference from other environmentally relevant metal ions. The shift in absorbance ratio was proportional to Hg2+ concentrations in the range of 0.01-10.0 μM.
A simple and rapid colorimetric assay for determination of mercury(II) ion (Hg2+) in aqueous solutions was developed based on aggregation of gold/silver alloy nanocomposites (Au/Ag NCs). Au/Ag NCs were aggregated after the addition of Hg2+ and the positively charged amino acid, lysine. The different aggregation degrees of Au/ Ag NCs is indicated by variations in the absorption spectra and accompanied by a color change from orange yellow to yellowish green. Under the optimal conditions, the shift of absorbance ratio (A650/A447) was proportional to Hg2+ concentrations in the range of 0.01-10.0 mu M. The limit of detection is 4.8 nM. The proposed colorimetric assay was extremely specific for Hg2+ and other environmentally relevant metal ions did not interfere with the determination.
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