Show simple item record

dc.contributor.authorJahangir, Mohammad M. R.*
dc.contributor.authorJohnston, Paul*
dc.contributor.authorKhalil, Mohammed I.*
dc.contributor.authorRichards, Karl G.*
dc.date.accessioned2013-08-07T13:51:47Z
dc.date.available2013-08-07T13:51:47Z
dc.date.issued11/05/2012
dc.identifier.citationM.M.R. Jahangir, P. Johnston, M.I. Khalil, K.G. Richards. Linking hydrogeochemistry to nitrate abundance in groundwater in agricultural settings in Ireland. Journal of Hydrology, 2012, 448–449, 212–222. DOI: 10.1016/j.jhydrol.2012.04.054en_GB
dc.identifier.issn0022-1694
dc.identifier.urihttp://hdl.handle.net/11019/414
dc.descriptionpeer-revieweden_GB
dc.description.abstractNitrate (NO3-–N) contamination of groundwater and associated surface waters is an increasingly important global issue with multiple impacts on terrestrial, aquatic and atmospheric environments. Investigation of the distribution of hydrogeochemical variables and their connection with the occurrence of NO3-–N provides better insights into the prediction of the environmental risk associated with nitrogen use within agricultural systems. The research objective was to evaluate the effect of hydrogeological setting on agriculturally derived groundwater NO3-–N occurrence. Piezometers (n = 36) were installed at three depths across four contrasting agricultural research sites. Groundwater was sampled monthly for chemistry and dissolved gases, between February 2009 and January 2011. Mean groundwater NO3-–N ranged 0.7–14.6 mg L−1, with site and groundwater depth being statistically significant (p < 0.001). Unsaturated zone thickness and saturated hydraulic conductivity (Ksat) were significantly correlated with dissolved oxygen (DO) and redox potential (Eh) across sites. Groundwater NO3-–N occurrence was significantly negatively related to DOC and methane and positively related with Eh and Ksat. Reduction of NO3-–N started at Eh potentials <150 mV while significant nitrate reduction occurred <100 mV. Indications of heterotrophic and autotrophic denitrification were observed through elevated dissolved organic carbon (DOC) and oxidation of metal bound sulphur, as indicated by sulphate (SO42-). Land application of waste water created denitrification hot spots due to high DOC losses. Hydrogeological settings significantly influenced groundwater nitrate occurrence and suggested denitrification as the main control.en_GB
dc.description.sponsorshipDepartment of Agriculture, Food and the Marine Ireland - Research Stimulus Fund Programme (Grant RSF 06383); Department of Civil, Structural and Environmental Engineering, Trinity College Dublin.en_GB
dc.language.isoenen_GB
dc.publisherElsevieren_GB
dc.relation.ispartofseriesJournal of Hydrology;vol 448-449
dc.subjectKsaten_GB
dc.subjectDissolved organic Cen_GB
dc.subjectDissolved oxygenen_GB
dc.subjectRedox-potentialen_GB
dc.subjectSO42-en_GB
dc.subjectNitrate retentionen_GB
dc.titleLinking hydrogeochemistry to nitrate abundance in groundwater in agricultural settings in Irelanden_GB
dc.typeArticleen_GB
dc.identifier.rmis5605
dc.identifier.doihttp://dx.doi.org/10.1016/j.jhydrol.2012.04.054
dc.contributor.sponsorDepartment of Agriculture, Food and the Marine, Ireland
dc.contributor.sponsorDepartment of Civil, Structural and Environmental Engineering, Trinity College Dublin
dc.contributor.sponsorGrantNumberRSF 06383
refterms.dateFOA2018-01-12T07:35:23Z


Files in this item

Thumbnail
Name:
Publisher version
Thumbnail
Name:
Jahangir et al postprint_JHYDR ...
Size:
200.3Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record