VARIABILITY OF CADMIUM, COPPER AND ZINC LEVELS IN MOLLUSKS AND ASSOCIATED SEDIMENTS FROM CHILE

The concentrations of cadmium, copper and zinc in mussel and sediment samples collected together from eight different geographical coastal a reas of Chile were determined. The mussels studied were 'Chorito Maico ', 'Almejas' and 'Navajuelas Chilenas' (Perumytilus purpuratus, Semell e solida and Tagellus dombeii, respectively). Sampling was carried out in July and September 1992 and January and April 1993 (winter, spring , summer and autumn seasons in Chile, respectively). The metal levels in these mussels varied among species; there were several sites where the metal concentrations in molluscs approached or exceeded the criter ia levels for Cd, Cu and Zn in shellfish products: 1, 10 and 50 ppm ww respectively, which are regarded as safe levels for human consumption . The results of metal levels in sediments showed two areas clearly po lluted with Cu. Strong relationships between Cu concentrations in the three molluscs and sediments were found; weak correlations were observ ed for Zn in S. solida. Copyright (C) 1996 Elsevier Science Ltd