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In order to determine concentration levels of sorne heavy metals (Cd, Cu, Zn) in lea ves of the mangrove species Rhizophora mangle and Avicennia germinans, four samplings were made b~tween March and December 1993, in two from the Magdalenas coast. Leafmaterial, sediments, and surface water were taken. Metal concentrations and organic matter content were me.asured from the leaves and sediments. Sahnity, Redox potential, and pH were determined from the water. The metal contents in the samples were measured by FlameAtomicAbsorption Spectrophotometry. The general behavior of three metals in the two species was greatly influenced by the season. The comparison between the total metal contents at the two stations showed no statistically significant differences. In the large majority of cases the concentrations of the three metals were larger in A. germinans than in R .. mangle. Also, young leaves of both species had higher concentrations than old ones. The contents in the plant material and in the sediments showed the relation Cd < Cu < Zn both.
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