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(T/EH016) Heavy metals in fish tissues of the Natural Park of Monfrague (Caceres, Spain) . Garcia-Cambero, Jesus1, Garcia-Rubio, Lourdes1, Matas, Pura1, Miguez, Prado1, Soler, Francisco1, 1 ABSTRACT- Monfrague is a Natural Park of Extremadura (Spain) higly important since it has a great variety of animals including species in danger of extintion. It represents one of the most important aquatic nestling area and is crossed by the rivers Tajo and Tietar. In order to assess environmental quality, the accumulation of Zn, Cd, Pb and Cu in several tissues of fish from Tajo and Tietar rivers were studied and compared with those found in superficial waters. Water was monitored for the same metals during one year. After collection of specimens, fish were dissected and samples of liver, kidney, muscle and gills were digested in a mixture of concentrated acids. Analysis of Zn, Cd, Pb and Cu were made in all cases using voltamperometry. Heavy metals in water did not variate significantly between seasons and rivers. Zn significantly concentrated on gills, liver and kidney. Greater concentration of Cd was observed in kidney and liver. Cu was found preferably in liver and kidney and Pb accumulated more in liver and gills. Mean values of trace metals in muscle were lower than those found in the rest of the organs. Results differ greatly among fish in both rivers, however metal levels in fish are not concerned since they do not exceed legal tolerance and do not represent a risk for the life in this Natural Park. Key words: heavy metals, fish, Monfrague |
