Partition of arsenic in soils sediments and the origin of naturally elevated concentrations in groundwater of the southern pampa region (Argentina)
- Blanco, María del Carmen
- Paoloni, Juan Dario
- Morrás, Héctor José María
- Fiorentino, Carmen
- Sequeira, Mario Eduardo
- Amiotti, Nilda Mabel
- Bravo, Oscar Abel
- Díaz, Silvana Letisia
- Espósito, Martín Eduardo
DOIAbstract
Excessive arsenic concentrations above the Argentinean and WHO guidelines for drinking water (10 μg L -1) affects shallow aquifers of the southern Pampean Plain (Argentina) hosted in the Pampean and the Post Pampean formations (loess and reworked loess; Plio-Pleistocene-Holocene). Health problems related to high As concentrations in drinking waters are known as Endemic Regional Chronic Hydroarsenicism. Hydrochemistry of shallow groundwaters and soil geochemistry were investigated aiming to (1) understand the partition of As in the solid phase and its relationship with unacceptable As concentrations in waters, (2) identify the provision source of As to groundwaters. Only 5% of the samples had As concentrations < 10 μg L -1; in 27% As concent...
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