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New Easy Method for the Monitoring of Hg Concentration in Fish, Using a Nanostructured Gold Electrode



Author(s)

Agnese Giacomino, Gabriella Schirinzi, Arianna Pandi, Mery Malandrino, Rosanna Toniolo and Ornella Abollino

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DOI:10.17265/2162-5298/2015.07.006

The applicability of a gold nanoparticle-modified glassy carbon sensor (AuNPs-GCS) for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry (SW-ASV) is demonstrated. Mercury content in sample Tuna Fish ISPRA T22 was determined to value the accuracy of the determination. The concentration in this sample is not certified, so, the Hg amount was determined also with atomic absorption spectroscopy (AAS): the results obtained with ASV were in good agreement and confirmed literature value reported for this sample. Then, real samples of tuna fish were analyzed. The voltammetric analyses were performed using previously optimized conditions (deposition potential 0 V, step potential 0.004 V, frequency 150 Hz and amplitude 0.003 V). Medium exchange technique permitted to eliminate possible matrix effects. The concentrations in the real samples were found to be in agreement with the common Hg levels reported in literature for commercialized tuna fish in different countries.

Gold nanoparticle modified glassy carbon sensor, square wave stripping voltammetry, mercury, tuna fish, medium exchange