Trace metal species in aquatic samples of the Tabasco Lagoons, Mexico
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The trace metals (Cd, Cu, Pb, and Zn) were determined in the Carmen-La Machona lagoon system, Tabasco, Mexico, on the basis of relative lability by utilizing anodic stripping voltammetry and Ca-Chelax resin in successful column and batch procedures. The samples were collected at 19 stations in November 1993. Total soluble metals were found in a wide range: 30-57% for zinc, 31-38% for lead, and 34-38% for copper. Soluble cadmium was not detected in the lagoon system. Most of the metals were in a 'very labile' or 'moderately labile' fraction with a small percentage of 'slowly labile' and no 'inert' fraction.