TRACE-METAL SPECIES IN AQUATIC SAMPLES OF THE TABASCO LAGOONS, MEXICO

The trace metals (Cd, Cu, Ph, and Zn) were determined in the Carmen-La Machona lagoon system, Tabasco, Mexico, on the basis of relative labi lity 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 wid e range: 30-57% for zinc, 31-38% for lead, and 34-38% for copper. Solu ble cadmium was not detected in the lagoon system. Most of the metals were in a 'very labile' or 'moderately labile' fraction with a small p ercentage of 'slowly labile' and no 'inert' fraction.