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
The concentration of arsenic in the hair of the individuals living in Santana city was measured. 121 donors in urban and the periphery area were studied. The periphery of the city shows the highest levels of arsenic (5.94 +/- 6.54 mg kg(-1) - mean; 0.27-23.85 mg kg(-1)). 47.83% in the urban area showed arsenic concentrations of less than 1.00 mg kg(-1), while in the periphery only 11.22% had results below this value. The results showing the influence of residence location. The Principal Component Analysis showed that the variable residence location were responsible for the correct formation of the periphery group.
A presença de elementos não essenciais nas águas superficiais do rio Amazonas é uma preocupação global, o objetivo da pesquisa foi estudar a distribuição dos elementos As, Al, Mn, e Pb na água do estuário do rio Amazonas. As amostras foram coletadas em três regiões distintas: Canal Norte (AP), Canal Sul (PA) e rio Pará (PA) em três profundidades, com um total de 84 amostras. A espectrometria de emissão atômica com plasma indutivamente acoplado (ICPAES) foi utilizada para avaliar os teores de Al, Mn e Pb e a espectrofotometria de absorção atômica com geração de hidretos (HGAAS) foi usada para a análise do As. O As variou de <0,35 a 50,60 µg/L, o Al de <1,88 a 3347,70 µg/L, o Mn de 0,13 a 403,39 µg/L e Pb de <0,18 a 57,78 µg/L. Em média As (canal Sul), Al (todas as regiões), Mn (canal Norte e Sul) e Pb (canal Norte e Sul) se encontraram em valores acima do permitido pela legislação brasileira. Os elementos podem ter origem antrópica originária de atividade de mineração e industrial e origem natural proveniente de decomposição de rochas ígneas da bacia de drenagem do rio Amazonas que disponibilizam o elemento na forma ligada ao material particulado em suspensão.
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