Mg. Frias-espericueta et al., Heavy metals in the rock oyster Crassostrea iridescens (Filibranchia : Ostreidae) from Mazatlan, Sinaloa, Mexico, REV BIOL TR, 47(4), 1999, pp. 843-849
Two populations of Crassostrea iridescens were sampled off Mazatlan and in
a zone free of anthropogenic activity. The bivalves were collected from Feb
ruary 1992 to February 1993. Concentrations of Cd, Co, Cr, Cu, Fe, Mn, Ni a
nd Zn were determined by flame atomic absorption spectrophotometry. Annual
mean values in the sampling zone off Mazatlan were higher in Co, Cu, Fe, Mn
, Ni and Zn than in the sampling zone free of anthropogenic activity; howev
er, differences were not statistically significant at 95% confidence level.
Urban discharges in the coastal zone in front of Mazatlan city, have littl
e or no heavy metal concentrations dissolved or particulated.