Avaliação dos níveis de metais pesados no corpo aquático do açude Velho, Campina Grande-PB.

Abstract

This work aimed to determine heavy metals in Acude waters Old from the municipality of Campina Grande - PB. Along with the determination, their contents for verification of the risks to life and the environment in accordance with environmental legislation (357/2005 CONAMA). Three periods of collection and eight sampling bridges on the banks of the dam. One liter of water was collected from each point where each sample was filtered and treated with 50% nitric acid, later, they were analyzed by Atomic Absorption Spectrophotometer. The The results showed the existence of cadmium and copper at concentrations not equaled or exceeded those determined by CONAMA. The point determined as P5 presented the highest rate of these contaminants during the collection periods, where It features the installation of commercial bridges (bars and cafeterias). One of likely sources of cadmium contamination are PET bottle labels that are discarded in the waters of the acude that, in analysis, presented cadmium concentrations on all the different labels searched. Copper may have as sources contaminants, submerged metal wastes and others originating from the galleries reservoir supply It can be concluded that even being in small concentrations, copper and cadmium metals present a potential environmental hazard as that they have the capacity to expand in trophic relations and persist in the environment unchanged. The risk is most worrying about the fishermen who commercialize and consume the fish in this reservoir. further research to broaden information on the pollutants and risks present in the Old dam waters.