Atrazine was quantified in 50 % of the groundwater samples (at values ranging from 0.07 to 1.40 μg/L), and in 89 % of the bovine milk samples (from 2.51 to 20.97 μg/L). In addition, increased salinity was observed in the groundwater at greater distances from the aquifer's recharge area. A strong correlation was found between the chemical composition and the geomorphological characteristics of the plain. Eighteen dairy farms in the Pampean plain of Argentina were analyzed. This study aimed to determine its concentration in groundwater and bovine milk, as well as the risks it is likely to pose for human health. However, scarce studies have evaluated its bioaccumulation potential in bovine milk, a nutritional staple for children and the elderly both domestically and internationally. Dissolution of carbonates and cation exchange processes contribute to the observed groundwater chemistry especially in the relict paleosurface and piedmont.Ītrazine herbicide can bioaccumulate over time and thus affect humans for generations to come. It was interpreted that groundwater geochemistry is mainly linked to input from precipitation and weathering of silicates. Taking into account geomorphological and lithological features, both groundwater flow and hydrochemical aspects are linked with the main geomorphological environments: a relict paleosurface with a sedimentary cover, a rocky dissected paleosurface with filled valleys and the sedimentary piedmont. Sampled groundwaters are almost entirely of calcium and sodium bicarbonate geochemical type, with local occurrence of mixed type (sodium-calcium bicarbonate and sodium bicarbonate-sulfate) waters. The groundwater is fresh with electrical conductivities between 586 µS/cm and 2000 µS/cm, although there are localized samples in the piedmont of brackish type (up to 3900 µS/cm). Groundwater flow in the unconfined aquifer has developed in both sediments and fractured rocks. The objective of this work is to define the geomorphological characteristics of the basin and interpret their influence on hydrogeological processes, emphasizing hydrodynamic and hydrogeochemical aspects. Las Peñas stream basin, located in the Pampean Mountains of Cordoba (Argentina), has specific groundwater features which are of great interest for the local socioeconomic activities.
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