Abstract
In the South-eastern portion of the Iron Quadrangle, MG, Brazil, there are several dams, which were constructed by mining and steel companies. The Custodio dam is located in the Itacolomi State Park - an Environmental Protection Area at Ouro Preto. In order to assess the impact of constructed reservoirs in the hydrological system of the region, it is necessary to study a lake which can be considered non-conta minated, because the characteristics of the water and sediment of such a lake may be used as reference for other lakes of the region in the assessment of anthropogenic influences. Sediment and water sample data were submitted to Principal Component Analyses in order to assess the geochemical influences of the rocks on the sediment chemical composition, and to assess their geochemical relationship. Upper limit values for As (23.7 mg/kg), Ba (1923 mg/kg), Co (31,8 mg/kg), Cr (157 mg/kg), Cu (53,2 mg/kg), Ni (57,3 mg/kg), Pb (57,3 mg/kg), Rb (213 mg/kg), Sr (116 mg/kg), V (174 mg/kg) and Zn (92,1 mg/kg) are proposed as reference values. A comparison with some international sediment quality guideline values shows that three elements are above the PEL values (As 17 mg/kg, Cr 156 mg/kg and Ni 35,9 mg/kg). As, Cr and Ni are linked to the Banded Iron Formation.
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