Abstract

An empirical criterion for a possible classification of the sea water quality criteria is proposed. It entails the employment of bioindicators, and precisely the knowledge of metal content in algae (Ulva rigida) and clams (Tapes philippinarum), two species present in marine ecosystems. The elements considered are copper, lead, cadmium, zinc and mercury, while the instrumental techniques employed in the metal determination are differential pulse anodic stripping voltammetry (DPASV) and cold vapour atomic absorption spectroscopy (CV‐AAS). For the mercury determination in algae and clams a new digestion procedure is described. The analytical methods have been verified on three standard reference materials: Sea Water BCR‐CRM 403, Ulva lactuca BCR‐CRM 279 and Mussel Tissue BCR‐CRM 278. In the certified matrices, the accuracy and the precision, expressed as relative error and relative standard deviation, respectively, were for all the elements less than 6%.

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