Hydrogeochemistry of the Coxilha das Lombas Aquifer, Brazil

Abstract

The hydrogeochemical characterization of Coxilha das Lombas Aquifer, Brazil, was studied. Chemical characteristics from 23 groundwater samples and meteoric waters data from public registers were used. The ionic speciation and mineral dissolution/precipitation was calculated by EQ3/6 package software. The results showed low total dissolved solids (TDS) values and slightly acidic pH. The concentration of most abundant ions usually followed this trend Cl − >HCO 3 + >SO 4 2− >Na + . The characteristics of groundwaters and the chemistry similarity with the meteoric waters reflect their short residence time, due to high hydraulic conductivity, and low degree of water/rock interactions, due to sands composed mainly of quartz.

Spatial Variations of Major Ion Chemistry and Hydrogeochemical Processes of Groundwater, Menoufia Governorate, Egypt

“…The chemical compositions of the groundwater are dominated by Na + , Ca 2+ , HCO , which have been derived largely from natural chemical weathering of carbonates, gypsum and anthropogenic activities of fertilizer's sources. The abundance of major and minor ions is related mainly to rock/water interaction, the most important interactions are adsorption and mineral precipitation/dissolution (SubbaRao 2001;Kortatsi 2006;Herlinger 2007). The relationship between the major ions versus Cl concentration of water bodies and processes influence on the chemical composition are important factors because chloride is good indicator for mixing phenomenon (Somay et al,2007).…”