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Article

Hydrogeochemical Evolution of an Aquifer Regulated by Pyrite Oxidation and Organic Sediments

1
Departamento de Ingeniería y Morfología del Terreno, Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, Spain
2
C/Real 65, 42002 Soria, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Fernando António Leal Pacheco and Luís Filipe Sanches Fernandes
Water 2021, 13(17), 2444; https://doi.org/10.3390/w13172444
Received: 30 July 2021 / Revised: 2 September 2021 / Accepted: 2 September 2021 / Published: 6 September 2021
(This article belongs to the Special Issue Nitrates Pollution in Water: Sources, Pathways and Receptors)
Detailed full-scale groundwater monitoring was carried out over a period of nine years, sampling at selected points along the groundwater flow direction in its final stretch. This established the hydrogeochemical evolution along the flow of a natural system formed by a calcareous aquifer which discharges and then passes through a quaternary aquifer of lake origin which is rich in organic matter. This evolution is highly conditioned by the oxidation of pyrites that are abundant in both aquifers. In the first aquifer, one kilometre before the discharge location, oxidizing groundwater crosses a pyrite mineralization zone whose oxidation produces an important increase in sulphates and water denitrification over a short period of time. In the quaternary aquifer with peat sediments and pyrites, water experiences, over a small 500 m passage and residence time of between three and nine years, a complete reduction by way of pyrite oxidation, and a consequent increase in sulphates and the generation of hydrogen sulphuric acid. This is an example of an exceptional natural hydrogeological environment which provides guidance on hydrogeochemical processes such as denitrification. View Full-Text
Keywords: redox processes; groundwater; nitrate attenuation; pyrite oxidation; peat sediments redox processes; groundwater; nitrate attenuation; pyrite oxidation; peat sediments
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MDPI and ACS Style

Sanz, E.; Bezares, C.; Pascual, C.; Menéndez Pidal, I.; Fonolla, C. Hydrogeochemical Evolution of an Aquifer Regulated by Pyrite Oxidation and Organic Sediments. Water 2021, 13, 2444. https://doi.org/10.3390/w13172444

AMA Style

Sanz E, Bezares C, Pascual C, Menéndez Pidal I, Fonolla C. Hydrogeochemical Evolution of an Aquifer Regulated by Pyrite Oxidation and Organic Sediments. Water. 2021; 13(17):2444. https://doi.org/10.3390/w13172444

Chicago/Turabian Style

Sanz, Eugenio, Catalina Bezares, Carlos Pascual, Ignacio Menéndez Pidal, and Cristina Fonolla. 2021. "Hydrogeochemical Evolution of an Aquifer Regulated by Pyrite Oxidation and Organic Sediments" Water 13, no. 17: 2444. https://doi.org/10.3390/w13172444

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