Teores de As, Cd e Pb em solos e sedimentos de áreas de garimpo de ouro nos municípios de Pontes e Lacerda e Nova Lacerda, Vale do Alto Guaporé, MT
DOI:
https://doi.org/10.26848/rbgf.v9.6.p1805-1814Keywords:
Contaminação ambiental, elementos-traço, metal pesado, catreadoAbstract
Os solos funcionam como fonte ou dreno de elementos traço (ETs) no ambiente. O estudo foi realizado em três áreas de garimpo de ouro na região do Alto Guaporé, nos municípios de Pontes e Lacerda e Nova Lacerda, sudoeste do estado de Mato Grosso, tendo como finalidade avaliar a concentração de As, Cd e Pb em sedimentos e solos em duas profundidades de 0-20 e 20-40 cm. Os ETs foram determinados em forno de grafite após extração ácida conforme método USEPA SW-846-3050. Os resultados das analises de solo foram comparados com a resolução da CETESB nº 195/2005 e de sedimentos com CONAMA nº 344/2004 e CCME-EPC 1999. Os teores médios de ETs encontradas nos sedimentos foram (As 0,413; Cd 0,021; e Pb 1,618 mg kg-1) no garimpo da Lavrinha; (As 1,343; Cd 0,037; e Pb 3,198 mg kg-1) no garimpo Pau a Pique; e (As 1,093; Cd 0,020; e Pb: 2,060 mg kg-1) na mineração São Francisco. Nos solos os teores médios foram de (As 0,772; Cd 0,017 e Pb 2, 515, mg kg-1) no garimpo da Lavrinha; (As 2,579; Cd 0,021 e Pb 4,373 mg kg-1 ) no garimpo Pau a Pique; e (As 0,920; Cd 0,018 e Pb 3,198 mg kg-1) na mineração São Francisco. Os valores encontrados de As, Cd e Pb nos solos e sedimentos dessas áreas estão abaixo dos valores de referencia, de acordo com as legislações brasileira e canadense.
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