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. 2012:2012:856947.
doi: 10.1155/2012/856947. Epub 2012 Apr 3.

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

Li Ping Wu  1 , Hua Wen Zhao, Zhu Hong Qin, Xian Ying Zhao, Wen Dan Pu
Affiliations

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

Li Ping Wu et al. J Anal Methods Chem. 2012.

Abstract

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 (Δλ), 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.

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Figures

Figure 1
Figure 1
The absorption spectrum of AgNPs in the absence and presence of Hg (II) ion. (The inset picture displays color change corresponding to the curves: the solution color gradually changed from yellow to colorless.) Concentration: AgNPs: 6.5 × 10−5 mol/L; Hg (II) ion (from 1 curve to 5, ×10−6 mol/L): 0, 1.2, 3.2, 4.8, 6.0; HAc-NaAc buffer (pH 5.6).
Figure 2
Figure 2
The scanning electron microscopy of AgNPs in the absence and presence of Hg (II) ion. Concentration: AgNPs: 6.5 × 10−5 mol/L; Hg (II) ion (from A to D, ×10−6 mol/L): 0, 2.0, 4.0, 6.0; HAc-NaAc buffer (pH 5.6).
Figure 3
Figure 3
The influence of acidity. Concentration: AgNPs: 5.0 × 10−5 mol/L−1; Hg (II) ion: 6.0 × 10−6 mol/L; the pH of HAc-NaAc buffer (from 1 to 5): 3.8, 4.4, 5.0, 5.6, 6.2.
Figure 4
Figure 4
Effect of the AgNPs concentration. Concentration: AgNPs (×10−5 mol/L): 2.0, 3.5, 5.0, 6.5, 7.0, 7.5, 8.0, respectively; Hg (II) ion: 6.0 × 10−6 mol/L; HAc-NaAc buffer (pH 5.6). The inset picture displays color change with different concentration of AgNPs.
Figure 5
Figure 5
Selectivity of the reactive system. Concentration: AgNPs: 6.5 × 10−5 mol/L; Hg (II) ion: 6.0 × 10−6 mol/L; the other metal ions: 6.7 × 10−6 mol/L; HAc-NaAc buffer (pH 5.6).
Figure 6
Figure 6
Stability of the reactive system. Concentration: AgNPs: 6.5 × 10−5 mol/L; Hg (II) ion: 6.0 × 10−6 mol/L; t (min): 0, 3, 5, 8, 10, 15, 20, 25, respectively; HAc-NaAc buffer (pH 5.6).
Figure 7
Figure 7
The blue shift of the maximum absorption wavelength of AgNPs and Hg (II) ion concentration. A linear correlation exists over the range of 2.0 × 10−7–6.0 × 10−6 mol/L.
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