CUANTIFICACIÓN DE LAS CONCENTRACIONES DE METALES PESADOS EN TEJIDOS DE PECES Y CRUSTÁCEOS DE LA LAGUNA DE UNARE, ESTADO ANZOÁTEGUI, VENEZUELA
| Main Authors: | Aristide Márquez, William Senior, Ivis Fermín, Gregorio Martínez, Julián Castañeda, Ángel González |
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| Format: | Article |
| Terbitan: |
, 2008
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| Subjects: | |
| Online Access: |
http://www.scielo.org.ve/scielo.php?script=sci_arttext&pid=S0798-22592008000100012
Revista Científica, FCV-LUZ / Vol. XVIII, No 1, 73 - 86, 2008 |
Daftar Isi:
- The content of Fe, Mn, Cu, Cr, Ni, Zn, Cd and Pb in muscle tissues of fish and crustaceans from the Unare lagoon (Laguna de Unare) in the state of Anzoátegui, Venezuela, was analyzed by flame Atomic Absorption Spectrometry. The levels of these metals present in suspended material of the water and in sediments were also determined in order to detect possible impact on the ecosystem. The mean concentrations in the water were low (0.104-0.53 μmol/L Fe; 0.004-0.06 μmol/L Mn; 0.002-0.028 μmol/L Zn; 0.004-0.012 μmol/L Cr; undetectable-0.011 μmol/L Ni and undectable-0.001 μmol/L Cd). In the sediments, evidence was found of anthropogenic intervention with mean values in decreasing order of Mn (516.37) > Zn (127.49) > Ni (52.41) > Cr (51.69) > Cu (41.13) > Pb (29) > Cd (1.51 μg/g), all of which are greater than established levels for uncontaminated sediments. Toxic metals were detected in the examined organisms, such as lead and cadmium with levels above 0.16 and 0.04 μg/g, respectively, and zinc with levels greater than 17 μg/g in the majority of the species. ANOVA statistical tests (P < 0.05) show discrepancies in the concentrations or the metals in the tissues of the different genera and species, as well as in the values for individuals of the same species (Cathorops spixii) which live inside and outside of the lagoon. The levels are higher in those which live within the lagoon, which indicates bioaccumulation processes. This study confirms that the lagoon and its biota have suffered a progressive and important deterioration inasmuch as the neighboring population relies on the commercialization of the fish and crustaceans for their economic stability.