Monitoramento da qualidade da água de uma microbacia hidrográfica na região amazônica

Abstract

This work should be designed to monitor the water quality of the water resources of the watershed Caiabi river. This watershed is located in northern Mato Grosso. Economic activity in the region is based on agriculture, with grain production and grassland for livestock, with intensive use of pesticides and fertilizers. The groundwater was monitored with regard to nitrate concentration and Mn metal, Zn, Pb, Cu, Fe, Cd, Cr and Ni and the samples were collected in eleven wells for 12 months, from May 2014 to April 2015, on a monthly basis. Surface water was monitored in relation to concentrations of Mn metal, Zn, Pb, Cu, Fe, Cd and Ni and collections occurred in two phases, the 1 July 2012 to June 2013 and the second in two campaigns, one in September 2014 and another in February 2015. The methodologies used following the procedures described in Standard Methods for the Examination of Water and Wastewater. The results of this monitoring indicated that the ground water generally presented according to the current regulations, showing no restrictions on its use in relation to monitored parameters. Human activities, as well as how to use and occupation of land, affected the quality of surface water Caiabi River, with pollution in places and at certain times of year, however, there was no evidence the presence of point source pollution.