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

RESUMOVárias toneladas de rejeito de manganês contendo arsênio, gerado por uma empresa de mineração, foram utilizadas como aterro de ruas da cidade de Santana-AP. A possibilidade de exposição das pessoas residentes nessas localidades levou ao estudo de quantificação de arsênio total nos solos. Após a digestão, os teores de arsênio foram quantificados por espectrofotometria de absorção molecular usando um sistema automático de geração de hidretos (HG-MAS), diciclohexilamina/CHCl 3 como solvente do dietilditiocarbamato de prata (SDDC) e KBH 4 como redutor. O método apresentou bons resultados com sensibilidade (ε) de 1,10 10 4 L.mol -1 .cm -1 , estabilidade de 2,96% e outras vantagens em relação ao método oficial. O método foi aplicado em amostras de referência de solo com recuperação de 98,82 % (N=10). As análises de solos mostraram que do total de amostras analisadas 94,74 % apresentaram concentração de arsênio acima do valor editado pela CETESB para solo residencial (50 mg.kg -1 ) com valor médio de 682,96 mg.kg -1 , variando de 48,08 mg.kg -1 a 1.713,00 mg.kg -1 que comprova a contaminação do solo pelo arsênio. PALAVRAS-CHAVE: Rejeito, contaminação, SDDCArsenic spectrophotometric determination in soil of the Santana-AP city using the silver diethyldithiocarbamate (SDDC) modified method ABSTRACT Several tons of manganese residues containing arsenic, generated by a mining company, were used as streets landfill in SantanaAp city. The possibility of exposure of people living in these villages has led to the study of quantification of total arsenic in the soil. After digestion, the levels of arsenic were quantified by molecular absorption spectrophotometry using a hydrides generation automatic system (HG-MAS), dicyclohexilamine/CHCl 3 as silver diethyldithiocarbamate (SDDC) solvent and KBH 4 as reducer. The method presented good results with sensitivity (ε) of 1.10 10 4 l.mol -1 .cm -1 , stability of 2.96 % and other advantages in relation to the official method. The method was applied to the soil standard samples with recoveries of the 98.82 % (n=10). The soil analysis showed that 94.74 % samples showed arsenic concentrations above the value published by CETESB for residential land (50 mg.kg -1 ) with the average value of 682.96 mg.kg -1 , ranging of 48.08 mg.kg -1 at 1,713.00 mg.kg -1 shows that the soil arsenic contamination.

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.

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RESUMO:A escassez de água tornou-se um dos graves problemas mundiais. Nos últimos anos tem-se pensado sobre fontes alternativas de água como água da chuva e as chamadas águas cinzas. Porém, além de novas alternativas, a educação ambiental é condição necessária para modificar um quadro de crescente degradação socioambiental e junto a ela, a percepção ambiental é fundamental para o reconhecimento do saber e do que condiciona os comportamentos de um indivíduo ou um grupo em relação ao meio ambiente. O objetivo deste trabalho foi avaliar a percepção de alunos do quarto e quinto ano de escola do ensino fundamental, quanto à preservação e economia de água. Desenvolveu-se atividades com crianças do quarto e quinto ano da Escola Municipal de Ensino Fundamental Francisco de Souza Ramos em fevereiro de 2011 com palestra utilizando apresentação em Powerpoint. Ao final da palestra, aplicou-se questionários com perguntas objetivas e subjetivas. Das 79 crianças 70,8% perceberam a real distribuição da água na Terra e 67% responderam que é necessário preservar este recurso. Em relação à atividades que visem a economia, 92,4% tiveram consciência destes recursos. Assim como, 86% responderam que água pode ser reutilizada e 75,9% responderam que utilizariam um filtro biológico. Desta forma, os alunos demonstraram elevada percepção do que seria a economia de água e a preservação deste insumo. PALAVRAS-CHAVE:educação ambiental, escassez de água, fontes alternativas, percepção ambiental. PERCEPTION OF STUDENTS OF ELEMENTARY EDUCATION SCHOOL FRANCISCO DE SOUZA RAMOS, AS TO THE PRESERVATION AND WATER SAVINGABSTRACT: Water shortage has become one of the serious global problems. In recent years it has been thought about alternative sources of water like rainwater and greywater. However, in addition to new alternatives, environmental education is a necessary condition for modifying a framework of growing socio-environmental degradation and with it, environmental awareness is crucial for the recognition of knowledge and that affects the behavior of an individual or group in relation the environment. The aim of this study was to evaluate the students' perception of the fourth and fifth year of elementary school, for the preservation and saving water. Developed activities with the children of the fourth and fifth years of the Francisco de Souza Ramos Elementary School in February 2011 with a lecture using PowerPoint presentation. At the end of the lecture was applied questionnaires with objective and subjective questions. Of the 79 children 70.8% realize to the real distribution of water on Earth and 67% responded that it is necessary to preserve this resource. In relation to activities aimed at the economy, 92.4% were aware of these resources. As well as 86% responded that water can be reused and 75.9% said they would use a biological filter. Thus, students