Maria do Socorro Rocha da Silva

TL;DR: In this paper, the effect of human action on the Negro River water samples were collected, and pH, electric conductivity, dissolved oxygen, ammoniacal nitrogen and nitrite values indicated a worsening water quality in the Negro river, at the mouths of the Sao Raimundo (FISR) and Educandos (FIE) streams, which are the two major urban tributaries and receptors of domestic wastes and industrial effluents and downstream from them.

TL;DR: The lowest concentrations of the nutrients in the soil solution on the pristine forest (control plot) and in the remaining forest confirm the efficiency of the forest in nutrient cycling.

TL;DR: The Puraquequara River and its right-bank's tributary, the Agua Branca stream, are located in the outskirts of the Manaus urbanized area and their basin is still harbored by the primary rain forest cover.

TL;DR: In this article, the authors analyzed the physical and chemical characteristics and heavy metals in the surface waters in three different pluviometric periods and found that the quality of the water improves downstream to the Matrincha and Bolivia igarape in the beginning of the rainy period but with no great differences upstream.

TL;DR: In this article, the physical, chemical, and physicochemical properties of the waters of the Amazon Basin were analyzed using 288 water samples collected from the Amazon River and its tributaries from March 2009 to September 2012.