Qualidade dos recursos hídricos da
Quality of water resources in the Amazon region -Rio Tapajós: assessing the case for chemical elements and physical-chemical parameters ABSTRACTThe Tapajós river is the main river of the Pará State and part of the Amazon basin, the largest world river basin, however, the population growth and development of agriculture in the region has generated inputs of contaminants in this important river. The objective of this study was to evaluate the water quality of the Tapajós river in the presence of metals and physico-chemical parameters based on the CONAMA 357-05 resolution. Seven sampling stations were selected along the river in the surface, intermediate and bottom layers in low rainfall periods. The elements Ca, Mg, Al, Fe, Ba, Mn, Sr, Ti, Ag, Be, Cd, Co, Cr, Cu, Mo, Ni, Pb and Zn were determined using the inductively coupled plasma atomic emission spectrometry (ICP-AES). As was determined by ICP-AES with hydride generation, Hg was