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Nitrate pollution of groundwater; all right. . ., but nothing else?

Contamination from agricultural sources and, in particular, nitrate pollution, is one of the main concerns in groundwater management. However, this type of pollution entails the entrance of other substances into the aquifer, as well as it may promote other processes. In this study, we deal with hydrochemical and isotopic analysis of groundwater samples from four distinct zones in Catalonia (NE Spain), which include 5 different aquifer types, to investigate the influence of fertilization on the overall hydrochemical composition of groundwater. Results indicate that intense fertilizer application, causing high nitrate pollution in aquifers, also homogenize the contents of the major dissolved ions (i.e.; Cl-, SO42-, Ca2+, Na+, K+, and Mg2+). Thus, when groundwater in igneous and sedimentary aquifers is compared, significant differences are observed under natural conditions for Cl-, Na+ and Ca2+ (with p-values ranging from <0.001 to 0.038), and when high nitrate concentrations occur, these differences are reduced (most p-values ranged between 0.054 and 0.978). Moreover, positive linear relationships between nitrate and some ions are found indicating the magnitude of the fertilization impact on groundwater hydrochemistry (with R2 values of 0.490, 0.609 and 0.470, for SO42-, Ca2+ and Cl-, respectively). Nevertheless, the increasing concentration of specific ions is not only attributed to agricultural pollution, but to their enhancing effect upon the biogeochemical processes that control water-rock interactions. Such results raise awareness that these processes should be evaluated in advance in order to assess an adequate groundwater resources management

This study has been funded by the Spanish Government CGL2011-29975-c04/01 and /04 projects and the 2014SGR-1456 project from the Catalan Government

© Science of the Total Environment, 2016, vol. 539, p. 241-251

Elsevier

Author: Menció i Domingo, Anna
Mas-Pla, Josep
Otero Pérez, Neus
Regàs, Oriol
Boy Roura, Mercè
Puig i Caminal, Roger
Bach i Plaza, Joan
Domènech, Cristina
Zamorano Cáceres, Manel
Brusi i Belmonte, David
Folch i Sancho, Albert
Date: 2016 January 1
Abstract: Contamination from agricultural sources and, in particular, nitrate pollution, is one of the main concerns in groundwater management. However, this type of pollution entails the entrance of other substances into the aquifer, as well as it may promote other processes. In this study, we deal with hydrochemical and isotopic analysis of groundwater samples from four distinct zones in Catalonia (NE Spain), which include 5 different aquifer types, to investigate the influence of fertilization on the overall hydrochemical composition of groundwater. Results indicate that intense fertilizer application, causing high nitrate pollution in aquifers, also homogenize the contents of the major dissolved ions (i.e.; Cl-, SO42-, Ca2+, Na+, K+, and Mg2+). Thus, when groundwater in igneous and sedimentary aquifers is compared, significant differences are observed under natural conditions for Cl-, Na+ and Ca2+ (with p-values ranging from <0.001 to 0.038), and when high nitrate concentrations occur, these differences are reduced (most p-values ranged between 0.054 and 0.978). Moreover, positive linear relationships between nitrate and some ions are found indicating the magnitude of the fertilization impact on groundwater hydrochemistry (with R2 values of 0.490, 0.609 and 0.470, for SO42-, Ca2+ and Cl-, respectively). Nevertheless, the increasing concentration of specific ions is not only attributed to agricultural pollution, but to their enhancing effect upon the biogeochemical processes that control water-rock interactions. Such results raise awareness that these processes should be evaluated in advance in order to assess an adequate groundwater resources management
This study has been funded by the Spanish Government CGL2011-29975-c04/01 and /04 projects and the 2014SGR-1456 project from the Catalan Government
Format: application/pdf
ISSN: 0048-9697
Document access: http://hdl.handle.net/10256/12916
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2012-2015/CGL2011-29975-C04-04
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.scitotenv.2015.08.151
Articles publicats (D-CCAA)
Is part of: © Science of the Total Environment, 2016, vol. 539, p. 241-251
Rights: Tots els drets reservats
Subject: Nitrats -- Contaminació
Nitrates -- Pollution
Aigües subterrànies -- Contaminació
Groundwater -- Pollution
Aigua -- Química
Water chemistry
Anàlisi multivariable
Multivariate analysis
Title: Nitrate pollution of groundwater; all right. . ., but nothing else?
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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