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Mercury(II) trace detection by a gold nanoparticle-modified glassy carbon electrode using square-wave anodic stripping voltammetry including a chloride desorption step

Abstract : Gold nanoparticles (AuNPs) were deposited on a glassy carbon (GC) substrate by constant potential electrolysis and characterized by cyclic voltammetry in H2SO4 and field emission gun scanning electron microscopy (FEG-SEM). The modified AuNPs-GC electrode was used for low Hg(II) concentration detection using a Square Wave Anodic Stripping Voltammetry (SWASV) procedure which included a chloride desorption step. The comparison of the obtained results with our previous work in which no desorption step was used showed that this latter step significantly improved the analytical performances, providing a three time higher sensitivity and a limit of detection of 80 pM for 300 s preconcentration, as well as a lower average standard deviation. The influence of chloride concentration on the AuNPs-GC electrode response to Hg(II) trace amounts was also studied and its optimal value confirmed to be in the 10-2 M range. Finally, the AuNPs-GC electrode was used for the determination of Hg(II) in a natural groundwater sample from south of France. By using a preconcentration time of 3000 s, a Hg(II) concentration of 19 +/- 3 pM was found, which compared well with the result obtained by cold vapor atomic fluorescence spectroscopy (22 +/- 2 pM).
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Submitted on : Thursday, April 16, 2015 - 3:43:08 PM
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Laure Laffont, Teddy Hezard, Pierre Gros, Lars-Eric Heimbürger, Jeroen E. Sonke, et al.. Mercury(II) trace detection by a gold nanoparticle-modified glassy carbon electrode using square-wave anodic stripping voltammetry including a chloride desorption step. Talanta, Elsevier, 2015, vol. 141, pp. 26-32. ⟨10.1016/j.talanta.2015.03.036⟩. ⟨hal-01143054⟩

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