Isotope and microbiome data provide complementary information to identify natural nitrate attenuation processes in groundwater
| Autor: | Frederic Gich, Elena Hernández-del Amo, Anna Menció, Josep Mas-Pla, Lluís Bañeras |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Environmental Engineering Denitrification Nitrats Isòtops Aquifer 010501 environmental sciences 01 natural sciences 03 medical and health sciences Denitrifying bacteria chemistry.chemical_compound Nitrate Isotopes Groundwater pollution Groundwater -- Pollution Environmental Chemistry Desnitrificació Waste Management and Disposal 0105 earth and related environmental sciences Hydrology geography Hydrogeology geography.geographical_feature_category Nitrates Pollution Manure 030104 developmental biology chemistry Aigües subterrànies -- Contaminació Environmental science Groundwater |
| Zdroj: | Science of the Total Environment, 2017, núm. 613-614, p. 579-591 Articles publicats (D-B) Hernández-del Amo, Elena Menció i Domingo, Anna Gich Batlle, Frederic Mas-Pla, Josep Bañeras Vives, Lluís 2017 Isotope and microbiome data provide complementary information to identify natural nitrate attenuation processes in groundwater Science of the Total Environment 613-614 579 591 DUGiDocs – Universitat de Girona instname Recercat. Dipósit de la Recerca de Catalunya |
| Popis: | Natural attenuation processes alleviate the impact of fertilization practices on groundwater resources. Therefore, identifying the occurrence of denitrification has become a requirement for water quality management. Several approaches are useful for this purpose, such as isotopic and microbiological methods, each of them providing distinct but complementary information about denitrification reactions, attenuation rates and their occurrence in the aquifer. In this paper, we investigate the contribution of both approaches to describe denitrification in a consolidated rock aquifer (limestone and marls), with a porosity related to fracture networks located in the northeastern sector of the Osona basin (NE Spain). Isotopic methods indicated the origin of nitrate (fertilization using manure) and that denitrification occurred, reaching a reduction of near 25% of the nitrate mass in groundwater. The studied area could be divided in two zones with distinct agricultural pressures and, consequently, nitrate concentrations in groundwater. Denitrification occurred in both zones and at different levels, indicating that attenuation processes took place all along the whole hydrogeological unit, and that the observed levels could be attributed to a larger flow path or, in a minor extent, to mixing processes that mask the actual denitrification rates. Microbiological data showed a correlation between denitrifier genes and the isotopic composition. However, the groundwater microbiome and the distribution of denitrifying bacteria did not reveal a major influence on the denitrification level observed by isotopic methods. This focuses the interest of microbiological analysis to identify functional genes within the bacteria present in the aquifer. Results indicated that isotopic methods provide information of the overall denitrification ability of the hydrogeological unit, and that genomic data represent the processes actually acting nearby the well. A combination of both approaches is advised to support induced in situ attenuation actions in polluted sites. |
| Databáze: | OpenAIRE |
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