Journal
FOOD CHEMISTRY
Volume 221, Issue -, Pages 737-745Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.11.111
Keywords
Mercury; Gold nanoparticle-modified glassy carbon electrode; Solid gold electrode; Direct mercury analyser; Cold vapour atomic absorption spectroscopy
Funding
- CRT Foundation
- Ricerca Finanziata da Universita - Fondo per la Ricerca Locale
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The applicability to the determination of mercury in tuna of square wave anodic stripping voltammetry (SW-ASV) conducted at both solid gold electrode (SGE) and a gold nanoparticle-modified glassy carbon electrode (AuNPs-GCE) was demonstrated. Mercury content in two certified materials and in ten samples of canned tuna was measured. The performances of the electrodes were compared with one another as well as with two spectroscopic techniques, namely cold vapour atomic absorption spectroscopy (CV-AAS) and a direct mercury analyser (DMA). The results found pointed out that both SW-ASV approaches were suitable and easy-to-use method to monitor mercury concentration in tunas, since they allowed accurate quantification at concentration values lower than the maximum admissible level in this matrix ([Hg] = 1 mg/kg(wet weight,ww)). In particular, mercury detection at the AuNPs-GCE showed a LOQ in fish-matrix of 0.1 mu g/l, corresponding to 0.06 mg/kg(ww), with performance comparable to that of DMA. (C) 2016 Elsevier Ltd. All rights reserved.
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