Proposal of new analytical procedures for heavy metal determinations in mussels, clams and fishes.
New analytical procedures and sample mineralizations for the determination of copper, lead, cadmium, zinc and mercury in matrices such as mussels, clams and fishes are proposed. An H2SO4-HNO3 acidic mixture was used for the determination of copper, lead, cadmium and zinc. In the case of mercury, the sample digestion was performed using a concentrated suprapure H2SO4-K2Cr2O7 mixture and the results compared with those from other conventional methods. Differential pulse anodic stripping voltammetry (DPASV) was employed for simultaneously determining copper, lead, cadmium and zinc, while the mercury determination was carried out by cold vapour atomic absorption spectrometry (CV-AAS) with reduction with SnCl2, using an innovative method for sample dissolution. The analytical quality control procedures have been verified on three reference standard materials: Oyster Tissue NIST 1566, Mussel Tissue BCR-CRM 278 and Cod Muscle BCR-CRM 422. For all the elements in the certified matrices, the precision, expressed as relative standard deviation (Sr), and the accuracy, expressed as relative error (e), were of the order of 3-5%, while the detection limits were in the range 0.010-0.080 microgram/g.
Locatelli
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Department of Chemistry G. Ciamician, University of Bologna, Italy. clinio@ciam.unibo.it
D000818:Animals; D049872:Bivalvia; D004563:Electrochemistry / Q000379:methods / Q000592:standards; D005399:Fishes; D005506:Food Contamination / Q000032:analysis*; D007558:Italy; D019216:Metals, Heavy / Q000032:analysis*; D009132:Muscles / Q000737:chemistry; D017747:Seafood / Q000032:analysis*; D013054:Spectrophotometry, Atomic / Q000379:methods / Q000592:standards
D019216:Metals, Heavy