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The geological diversity of the Amazon Basin, as well as the pluvial regime, influences the characteristics of the waters. To know the water types of the rivers of the Amazon basin, 288 superficial water samples were collected, 94 of them along the Amazon River and 194 in their tributaries, from March 2009 to September 2012. The physical, chemical, and physicochemical properties were analyzed. Rivers with pH between 6.5 and 7.6 and electrical conductivity (40.00 80.00 μS cm) are water bodies that are influenced by the Andean region (e.g., the Amazon River and some of its right bank tributaries). On the other hand, the rivers with pH in the range of 3.5 to 5.5 and conductivity <30.00 μS cm, which are Amazon River’s left bank tributaries, reflect the characteristics of the Guiana Shield. The A contribution to the hydrochemistry and water typology of the Amazon River and its tributaries Maria do Socorro Rocha da Silva; Eduardo Antonio Ríos-Villamizar; Sebastião Átila Fonseca Miranda; Sávio José Filgueiras Ferreira; Sergio R. Bulcão Bringel; Núbia Abrantes Gomes; Luana Monteiro Silva; Domitila Pascoaloto; Genilson Pereira Santana; Hillândia Brandão Cunha Caminhos de Geografia Uberlândia v. 20, n. 72 Dez/2019 p. 360–374 Página 361 rivers with pH (6.0 to 7.0), low ionic charge, and conductivity <40.0 μS cm, such as the lower Amazon River’s right bank tributaries (Tapajos and Xingu) which are influenced by the Central Brazilian Shield, and also the middle/upper Amazon River’s right bank tributaries (Tefé, Coari and Jutaí).

A CONTRIBUTION TO THE HYDROCHEMISTRY AND WATER TYPOLOGY OF THE AMAZON RIVER AND ITS TRIBUTARIES