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Soils act as source or drain of trace elements (ETs) in the environment. The study was conducted in three areas of gold mining in the Valley Region of Guaporé, in the counties of Nova Lacerda and Pontes e Lacerda, in the southwestern part of the state of Mato Grosso, having the purpose of assessing the concentration of As, Cd and Pb in sediments and soils at two depths of 0-20 and 20-40 cm. The trace elements (ETs) were determined in graphite furnace after acid extraction according to USEPA SW-846-3050. The soil analysis results were compared with the resolution of CETESB n°. 195/2005 and the sediments with CONAMA 344/2004 and CCME EPC-1999. The average contents of trace elements (ETs) found in sediments were (As 0,413; Cd 0.021; Pb 1.618 mg kg) in the Lavrinha mine; (As 1,343, 0,037 Cd, Pb and 3.198 mg kg) in the Pau a Pique mine; and (As 1,093; Cd 0,020 and Pb: 2,060 mg kg) in the São Francisco mine.. The average contents in soils were (As 0,772; Cd 0,017 and Pb 2, 515 mg kg) in the Lavrinha mine; (As 2,579; Cd 0,021; and Pb 4,373 mg kg) in the Pau a pique mine and (As 0,920; Cd 0,018, and Pb 3,198 mg kg) in the São Francisco mine. The values of As, Cd and Pb in soils and sediments of these areas are below the reference values, according to the Brazilian and Canadian laws.

revista brasileira de geografia física

Levels of As, Cd and Pb in soils and sediments from gold mining areas in the municipalities of Pontes e Lacerda and Nova Lacerda, in the Vale do Alto Guaporé, (Valley of the High Guaporé ), MT