Da Costa Neto, A.Bonotto, Daniel Marcos [UNESP]Mesquita, F. L A2014-05-272014-05-272003-12-01Sustainable World, v. 8, p. 3-14.http://hdl.handle.net/11449/67524This investigation was carried out at the Madeira River basin, located in the state of Rondônia, Brazilian Amazon. Sediments from Madeira River between Teotônio and Santo Antônio waterfalls along 25 km upstream from Porto Velho, the capital of Rondônia state, and from nine lakes located around Porto Velho municipality were chemically analyzed for Se (IV) in order to evaluate the main factors affecting the Se(IV) distribution in the environment, Selenite ion was chosen to investigate the selenium behavior in the area, because acid conditions are dominant there. The importance of clays, iron oxides, organic matter and minor refractory minerals was considered in order to explain most of the obtained data.3-14engEnamelsEnvironmental impactLakesMembranesNutritionPigmentsRedox reactionsRefractory materialsSedimentsSelenium compoundsToxicityWastewaterAcid conditionsGeogenic factorsMadeira River basinwaterfallsRiver basin projectsTrabalho apresentado em evento10.2495/EHR030011Acesso aberto2-s2.0-29426918997430102726026121