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Wild Salmonids in Italian Northwest Inland Waters: Cadmium, Mercury and Lead Pollution pp. 349-358 $100.00
Authors:  (Prearo Marino, Squadrone Stefania, Elia Antonia Concetta, Gavinelli Stefania, Tarasco Renata, Minardi Diana, Dörr Ambrosius Josef Martin & Abete Maria Cesarina, State Veterinary Institute of Piedmont, Liguria and Valle d’Aosta, Via Bologna, 148 - 10154 Turin – Italy, and others)
Abstract:
In the last years heavy metal concentrations resulting from industrial pollution increased considerably in water ecosystems. These elements are not easy to remove and they can raise bio-accumulation along the food chain and exert toxicity to humans. The aim of this study was to evaluate heavy metal contamination (Cadmium, Mercury and Lead) in the muscle and liver of wild Salmonids caught in Piedmont and Aosta Valley water basins, in order to establish correlations between fish species and fishing location. Several samples of Salmonids from Grana, Pesio, Gesso, Chiusella and Ticino basins (Piedmont) and Dora Baltea basin (Aosta Valley) were analyzed. The two fish species employed for this study were brown trout (Salmo trutta trutta) and rainbow trout (Oncorhynchus mykiss). Levels of Cd, Hg and Pb were measured in the muscle and liver of brown trout (50 specimens) and rainbow trout (25 specimens). Each sample (2 g) was mineralized in a high-pressure microwave oven with nitric acid (7 mL) and oxygen peroxide (1.5 ml). Detection of metals was performed using ETA-AAS with Zeeman background correction for Cd and Pb, with direct analyzer TDA-AAS (Thermal decomposition amalgamation and Atomic absorption spectrophotometry) for Hg. The quantification limits (LOQ) are 0.01 mg/kg (ppm) for Cd; 0.04 mg/kg for Pb and 0.10 mg/kg for Hg. All the analyzed samples resulted with lower than limit of quantization for Hg.
No sample exceeded the MRLs (maximum residue limits) set by EU regulation in fish muscle (Cd 0.05 mg/kg, Hg 0.50 mg/kg, Pb 0.30 mg/kg) for Hg and Cd content, while one sample resulted in 1.53 mg/kg of Pb.
This survey indicates that Salmonids caught in Northwest Italian inland waters do not represent a considerable risk for human health. 


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Wild Salmonids in Italian Northwest Inland Waters: Cadmium, Mercury and Lead Pollution pp. 349-358