Variação espaço-temporal de parâmetros físico-químicos e do fluxo de elementos-traço biologicamente essenciais na bacia do Rio Negro - AM

Abstract

This research studied the Rio Negro watershed, corresponding to a drainage area of approximately 719,000 km², considered the sixth largest river in the world in water volume, and the second largest tributary of the Amazon River. The objective was to characterize the spatial and temporal variability of physicochemical parameters and the flux of biologically essential trace elements, Co, Cu, Fe, Mg, Mn, Mo and Zn. We used the base of the Hybam Program, which makes data available to the scientific community, regarding the seasonal variations of water, sedimentary and geochemical fluxes in the Amazon Basin. The processed data configured 3 groups of analysis: a) temporal - from the historical series from 2003 to 2017 for Serrinha and Caracaraí; b) Physicochemical parameters - from 1996 to 2012; c) longitudinal analysis - 1996 campaign for eight stations: Cucuí, Cunuri, Jalauaca, Jusante Cachoeira do Caju, Missão Içana, Paricatuba, São Felipe and Taraquá. The analysis groups were submitted to the hydrological cycle of the rivers. The flux of the trace elements in Caracaraí and Serrinha, respectively, in the following decreasing order of concentration: [Mg]> [Fe]> [Zn]> [Mn]> [Cu]> [Co]> [Mo] and [Fe]> [Mg]> [Mn]> [Zn]> [Cu]> [Co]> [Mo], the fluxes in Serrinha were greater than in Caracaraí explained mainly by the net discharge of Serrinha being greater than in Caracaraí. The mass balance indicated production of elements in the studied stretch. The study indicates spatio-temporal variation of the parameters.