RESUMO Nesse trabalho são apresentados os resultados dos ensaios espectrofotométricos realizados nas amostras retiradas das águas do Rio Guaraguaçú localizado no litoral Paranaense. Esses ensaios foram realizados para quantificar o elemento fósforo pelo método do azul de molibdênio e o elemento nitrogênio pelos métodos de Griess e indofenol. Com esses resultados foi possível avaliar que o referido rio vem sofrendo com a atividade antrópica no seu entorno. Os resultados de fosfato estão acima dos valores estabelecidos pela Resolução 357/2005 do CONAMA, sendo que esses resultados, quando comparados com os obtidos em outro rio da região, são similares, daí observa-se que esse fato não é provocado por atividade antrópica. Já os resultados das concentrações dos íons amônio, nitrato e nitrito indicam que os valores obtidos estão abaixo dos valores máximos estabelecidos pela referida resolução, denota-se então que a presença desses dois últimos íons em águas superficiais ocorre onde a atividade antrópica está em expansão.

ABSTRACT In this paper are present the results of spectrophotometric tests performed on water samples taken from the Guaraguaçú River located on the coast of Paraná State, Brazil. These tests were conducted to quantify the element phosphorus by the blue molybdenum method and the element nitrogen by Griess and indophenol methods. With these results it was possible to assess that this river has been suffering with anthropic activity in your surroundings. The results of phosphate are above the levels established in Resolution 357/2005 of CONAMA, and these results compared with those obtained in other river in the region are similar, hence we observe that this fact is not caused by human activity. Since the results of the concentrations of ammonium, nitrate and nitrite indicate that the values obtained are below the maximums established by that resolution, then we denote that the presence of the latter two ions in surface water occurs where anthropic activity is expanding.

Environmental chambers were designed for the accelerated ageing of materials used in artistic artifacts to study the synergistic action of temperature, humidity, UV and visible radiation and gaseous pollutants. Two inox-steel/PTFE compartments are kept under controlled temperature and relative humidity, whose values are transmitted to a PC, which stores, plots in real time and continuously feedback heating and humidifying devices through logical signals. A borosilicate, or quartz, window allows the irradiation inside the chamber from an external source. A flow of purified air purges the chamber and conveys selected pollutants from an external source. Each independent compartment works under either stationary or cyclic conditions.