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- W2002256133 abstract "Overexploitation of crystalline aquifers in a semi-arid climate leads to a degradation of water quality, with the main processes responsible for the observed salt loads probably being irrigation return flow (IRF) and a high evaporation rate. The present study has focused on modelling the F− accumulation caused by IRF below rice paddy fields in the small endorheic Maheshwaram watershed (Andhra Pradesh, Southern India). The transient simulation was performed with a 1D reactive transport PHREEQC column and took into account IRF evaporation, kinetically controlled mineral dissolution/precipitation, ion adsorption on Fe hydroxides, and mixing with fresh groundwater. The results revealed the role of cationic exchange capacity (CEC) in Ca/Na exchange and calcite precipitation, both favouring a decrease of the Ca2+ activity that prevents fluorite precipitation. Iron hydroxide precipitation offers a not inconsiderable adsorption capacity for F− immobilization. The principal sources of F− are fluorapatite dissolution and, to a lesser extent, allanite and biotite dissolution. Anthropogenic sources of F−, such as fertilizers, are probably very limited. After simulating an entire dry-season irrigation cycle (120 days), the results are in good agreement with the observed overall increase of Cl− in the Maheshwaram groundwater. The model enables one to decipher the processes responsible for water-resource degradation through progressive salinization. It shows that F− enrichment of the groundwater is likely to continue in the future if groundwater overexploitation is not controlled." @default.
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- W2002256133 date "2013-02-01" @default.
- W2002256133 modified "2023-10-12" @default.
- W2002256133 title "Simulating fluoride evolution in groundwater using a reactive multicomponent transient transport model: Application to a crystalline aquifer of Southern India" @default.
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- W2002256133 doi "https://doi.org/10.1016/j.apgeochem.2012.11.001" @default.
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