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Level and source of contamination of aquatic ecosystems are usually determined by the concentration of pollutant metals in sediments. This study aimed to determine the effects of dairy activities on the contamination of sediments by Cu, Fe, Mn, Zn, Cd, Pb, Cr and Al. Samples were collected upstream and downstream from cattle watering points in 31 creeks located in the Meia Ponte river region, which is the main dairy area in the State of Goiás, Brazil. The metals were analyzed by atomic absorption at sediment fractions <0.063mm after acid digestion. Except for Al and Zn, the other metals showed low concentrations. Data comparison with Canadian standards for sediment quality (VGQS) showed Zn may pose a risk of biota contamination whereas Cu, Cd, Pb and Cr do not. In contrast to other metals which showed no significant differences between upstream and downstream, Zn showed higher concentration in upstream samples. In conclusion, the studied metals are associated with geological processes so the dairy activities do not contribute to stream contamination with these metals.

Metais Poluentes em Sedimentos Fluviais de Cursos D-agua sob Influência de Pecuária Leiteira no Estado de Goiás, Brasil