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Journal of Analytical Methods in Chemistry
Volume 2012, Article ID 856947, 5 pages
Research Article

Highly Selective Hg (II) Ion Detection Based on Linear Blue-Shift of the Maximum Absorption Wavelength of Silver Nanoparticles

1Department of Chemistry, Third Military Medical University, Chongqing 400038, China
2College of Chemistry and Chemical Engineering, MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China

Received 5 November 2011; Accepted 1 February 2012

Academic Editor: Dario Compagnone

Copyright © 2012 Li Ping Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new method of detecting Hg (II) ion with silver nanoparticles (AgNPs) is developed in this contribution. When Hg (II) ions were added into AgNPs solution, the solution displayed rapid color change and blue shift of the maximum absorption wavelength ( Δ 𝜆 ), which was in proportion to the Hg (II) ion concentration over the range of 2.0 × 10−7–6.0 × 10−6 mol/L, with detection limit (3σ) of 6.6 × 10−9 mol/L. Under the same experimental conditions, other metal ions did not interfere. Thus, we propose a rapid, simple and highly selective method for detecting Hg (II) ion.