Cluster analysis and geochemical processes for the characterization of the aquifer system in Maracanã/São Luis/MA

dataset

posted on 2018-12-26, 02:54 authored by João Batista Almeida, João Filomeno Barros, Bruno Alves de Mesquita, Carla Maria Salgado Vidal Silva, Josué Mendes Filho, Horst Frischkorn, Maria Marlúcia Freitas Santiago

ABSTRACT To better know the aquifer system in the Maracanã Environmental Protection Area were collected samples in four campaigns; the first during the drought season and the others in the following rainy one. The water samples were analised for eleven hydrochemical parameters, CE, Ca2+, Mg2+, Na+, K+, Cl-, SO42-, HCO3-, NO3-, Fe and P. Cluster analysis separated the wells in the area, identifing three different groups that exploit water with electrical conductivity in the ranges of 230 to 400 μS/cm, 87 to 210 μS/cm, and 22 to 64 μS/cm, respectively. Data show a predominance of sodium chlorinated water. With these results and identification of geochemical processes determined by changes in concentrations of Fe and P it was possible to develop a model that identifies the aquifer of the aquifer system exploited by each well.