RT Journal Article
T1 Denitrification in a hypersaline lake–aquifer system (Pétrola Basin,Central Spain): The role of recent organic matter and Cretaceous organicrich sediments
A1 Gómez Alday, J.J.
A1 Carrey, R.
A1 Valiente, Nicolás
A1 Otero, Neus
A1 Soler, A.
A1 Ayora, C.
A1 Sanz Bas, David
A1 Muñoz Martín, Alfonso
A1 Castaño, S.
A1 Recio, C.
A1 Carnicero, A.
A1 Cortijo, A.
AB Agricultural regions in semi-arid to arid climates with associated saline wetlands are one of the most vulnerable environments to nitrate pollution. The Pétrola Basin was declared vulnerable to NO3 − pollution by the Regional Government in 1998, and the hypersaline lake was classified as a heavily modified body of water. The study assessed groundwater NO3 − through the use of multi-isotopic tracers (δ15N, δ34S, δ13C, δ18O) coupled to hydrochemistry in the aquifer connected to the eutrophic lake. Hydrogeologically, the basin shows two main flow components: regional groundwater flow from recharge areas (Zone 1) to the lake (Zone 2), and a density-driven flow from surface water to the underlying aquifer (Zone 3). In Zones 1 and 2, δ15NNO3 and δ18ONO3 suggest that NO3 − from slightly volatilized ammonium synthetic fertilizers is only partially denitrified. The natural attenuation of NO3 − can occur by heterotrophic reactions. However, autotrophic reactions cannot be ruled out. In Zone 3, the freshwater–saltwater interface (down to 12–16 m below the ground surface) is a reactive zone for NO3 − attenuation. Tritium data suggest that the absence of NO3 − in the deepest zones of the aquifer under the lake can be attributed to a regional groundwater flow with long residence time. In hypersaline lakes the geometry of the density-driven flow can play an important role in the transport of chemical species that can be related to denitrification processes.
PB Elsevier
SN 0048-9697, ESSN: 1879-1026
YR 2014
FD 2014
LK https://hdl.handle.net/20.500.14352/34607
UL https://hdl.handle.net/20.500.14352/34607
LA eng
NO Castilla–La Mancha Government
NO Spanish Government
NO Catalan Government
DS Docta Complutense
RD 15 ago 2024