title: Anodic stripping voltammetry with gold electrodes as an alternative method for the routine determination of mercury in fish. Comparison with spectroscopic approaches.
abstract: 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]=1mg/kgwet weight,ww). In particular, mercury detection at the AuNPs-GCE showed a LOQ in fish-matrix of 0.1μg/l, corresponding to 0.06mg/kgww, with performance comparable to that of DMA.
authors.affiliation: Department of Drug Science and Technology, University of Torino, 10125 Torino, Italy.
authors.forename: Agnese
authors.initials: A
authors.lastname: Giacomino
authors.affiliation: Department of Chemistry, University of Torino, 10125 Torino, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Ruo Redda
authors.affiliation: Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta (IZSPLV), 10100 Torino, Italy.
authors.forename: Stefania
authors.initials: S
authors.lastname: Squadrone
authors.affiliation: Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta (IZSPLV), 10100 Torino, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Rizzi
authors.affiliation: Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta (IZSPLV), 10100 Torino, Italy.
authors.forename: Maria Cesarina
authors.initials: MC
authors.lastname: Abete
authors.affiliation: Department of Chemistry, University of Torino, 10125 Torino, Italy.
authors.forename: Carmela
authors.initials: C
authors.lastname: La Gioia
authors.affiliation: Department of Agricultural, Food, Animal and Environmental Sciences, University of Udine, Udine 33100, Italy.
authors.forename: Rosanna
authors.initials: R
authors.lastname: Toniolo
authors.affiliation: Department of Chemistry, University of Torino, 10125 Torino, Italy. Electronic address: ornella.abollino@unito.it.
authors.forename: Ornella
authors.initials: O
authors.lastname: Abollino
authors.affiliation: Department of Chemistry, University of Torino, 10125 Torino, Italy.
authors.forename: Mery
authors.initials: M
authors.lastname: Malandrino
mesh_terms: D000818:Animals; D055664:Electrochemical Techniques; D004566:Electrodes; D005506:Food Contamination / Q000032:analysis*; D006046:Gold / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D013054:Spectrophotometry, Atomic; D014413:Tuna; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D006046:Gold; D008628:Mercury
keywords: Cold vapour atomic absorption spectroscopy; Direct mercury analyser; Gold nanoparticle-modified glassy carbon electrode; Mercury; Solid gold electrode