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Evaluation Of Trace Elements In Water Of An Environmental Protection Area Located In The Lagoa Farm, Monte Belo District, Minas Gerais State, Brazil

Gustavo de Souza Pess�?´a, Fabr�?­cio Santos Gon�?§alves de Oliveira, F�?¡bia Aparecida Rabelo da Fonseca, Lidiane Raquel Verola Mataveli

Trace elements are present in aquatic environment due to natural geological processes, spilling of industrial and agricultural residues. Aluminum, iron and manganese are important in aquatic oxidation processes, besides being essential micronutrients. The aims of this study was to determine metals (Al, Fe and Mn) in water samples of an environmental protection area, located in the Lagoa Farm, Monte Belo District, Minas Gerais State, Brazil, and to make inferences about its contribution in the ecosystem. Samples of different points were collected from April to September 2004. Physico chemical parameters were analyzed, such as pH, redox potential, temperature and conductivity. The metals were determined by flow injection analysis (FIA) with spectrophotometric detection. The highest concentrations were found in April (Al: 0.621 mg L-1; Fe: 1.667 mg L-1; and Mn: 0.553 mg L-1) and the lowest in June(Al: 0.199 mg L-1; Fe: 0.638 mg L-1; and Mn: 0.059 mg L-1). Thus, a seasonal variation of these elements was verified. Relationships between metals concentrations and redox potential, were also noted.