Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling
In this study the processes affecting groundwater chemistry in the Eocene Brussels sands aquifer in Central Belgium are identified based on evaluation of ionic ratios of major solutes. Based on these results, in combination with mineralogical and hydrogeological information of the aquifer, a geochem...
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ftorbi:oai:orbi.ulg.ac.be:2268/3587 2024-04-21T07:59:36+00:00 Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling Peeters, Luk Batelaan, Okke Dassargues, Alain Aquapôle - ULiège 2007 https://orbi.uliege.be/handle/2268/3587 https://orbi.uliege.be/bitstream/2268/3587/1/publi159-2007.pdf en eng https://orbi.uliege.be/handle/2268/3587 info:hdl:2268/3587 https://orbi.uliege.be/bitstream/2268/3587/1/publi159-2007.pdf open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Groundwater and Ecosystems, Proc. of the XXXV IAH Congress (2007); XXXV IAH Congress (International Association of Hydrogeologists), Lisboa, Portugal [PT], 2007 Groundwater phreatic aquifer sandy aquifer sources of major solutes geochemical mass-balance ionic ratios aquifer in Central Belgium Hydrogeochemistry weathering anthropogenic influence Engineering computing & technology Geological petroleum & mining engineering Ingénierie informatique & technologie Géologie ingénierie du pétrole & des mines conference paper http://purl.org/coar/resource_type/c_5794 info:eu-repo/semantics/conferenceObject 2007 ftorbi 2024-03-27T14:42:13Z In this study the processes affecting groundwater chemistry in the Eocene Brussels sands aquifer in Central Belgium are identified based on evaluation of ionic ratios of major solutes. Based on these results, in combination with mineralogical and hydrogeological information of the aquifer, a geochemical mass-balance model is created to quantify the contribution of each of the processes to the observed composition of groundwater. After a rigorous validation process, a dataset of 99 groundwater samples is obtained from observation and pumping wells in the Eocene Brussels sands aquifer, which is one of the main aquifers for drinking water production in Belgium. The aquifer consists of heterogeneous alteration of calcified and silicified coarse sands, with local presence of clay drapes and glauconite-rich zones (Laga et al. 2001). The entire aquifer is overlain by Quaternary eolian deposits, mainly consisting of loam with the exception of the north east, where the Quaternary deposits are sandy loam. The groundwater in this aquifer is of Ca-Mg-HCO3-type with locally elevated nitrate concentrations. Based on the evaluation of ionic ratios and the mineralogy of the aquifer, a conceptual geochemical model is developed for mass-balance modeling, including (1) concentration of precipitation by a factor 1 to 5 due to evaporation, (2) dissolution of a pure calcite phase and a calcite phase containing 25 % magnesium by both carbonic acid and sulfuric acid, (3) anthropogenic inputs for all major cations and anions except bicarbonate, (4) dissolution of glauconite, (5) cation exchange of sodium and potassium for calcium and magnesium. The two calcite phases can be thought of as end-members of a solid solution of magnesium in calcite. The mass-balance modeling consists of a mole-balance equation for each considered element according to: [Obs] = p[Prec] + p1[Phase 1] + . + pi[Phase i] + a [Anthropogenic] +/- c[Cation Exchange] This set of linear equations is additionally constrained by (1) defining a range for concentration ... Conference Object Carbonic acid University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Groundwater phreatic aquifer sandy aquifer sources of major solutes geochemical mass-balance ionic ratios aquifer in Central Belgium Hydrogeochemistry weathering anthropogenic influence Engineering computing & technology Geological petroleum & mining engineering Ingénierie informatique & technologie Géologie ingénierie du pétrole & des mines |
spellingShingle |
Groundwater phreatic aquifer sandy aquifer sources of major solutes geochemical mass-balance ionic ratios aquifer in Central Belgium Hydrogeochemistry weathering anthropogenic influence Engineering computing & technology Geological petroleum & mining engineering Ingénierie informatique & technologie Géologie ingénierie du pétrole & des mines Peeters, Luk Batelaan, Okke Dassargues, Alain Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling |
topic_facet |
Groundwater phreatic aquifer sandy aquifer sources of major solutes geochemical mass-balance ionic ratios aquifer in Central Belgium Hydrogeochemistry weathering anthropogenic influence Engineering computing & technology Geological petroleum & mining engineering Ingénierie informatique & technologie Géologie ingénierie du pétrole & des mines |
description |
In this study the processes affecting groundwater chemistry in the Eocene Brussels sands aquifer in Central Belgium are identified based on evaluation of ionic ratios of major solutes. Based on these results, in combination with mineralogical and hydrogeological information of the aquifer, a geochemical mass-balance model is created to quantify the contribution of each of the processes to the observed composition of groundwater. After a rigorous validation process, a dataset of 99 groundwater samples is obtained from observation and pumping wells in the Eocene Brussels sands aquifer, which is one of the main aquifers for drinking water production in Belgium. The aquifer consists of heterogeneous alteration of calcified and silicified coarse sands, with local presence of clay drapes and glauconite-rich zones (Laga et al. 2001). The entire aquifer is overlain by Quaternary eolian deposits, mainly consisting of loam with the exception of the north east, where the Quaternary deposits are sandy loam. The groundwater in this aquifer is of Ca-Mg-HCO3-type with locally elevated nitrate concentrations. Based on the evaluation of ionic ratios and the mineralogy of the aquifer, a conceptual geochemical model is developed for mass-balance modeling, including (1) concentration of precipitation by a factor 1 to 5 due to evaporation, (2) dissolution of a pure calcite phase and a calcite phase containing 25 % magnesium by both carbonic acid and sulfuric acid, (3) anthropogenic inputs for all major cations and anions except bicarbonate, (4) dissolution of glauconite, (5) cation exchange of sodium and potassium for calcium and magnesium. The two calcite phases can be thought of as end-members of a solid solution of magnesium in calcite. The mass-balance modeling consists of a mole-balance equation for each considered element according to: [Obs] = p[Prec] + p1[Phase 1] + . + pi[Phase i] + a [Anthropogenic] +/- c[Cation Exchange] This set of linear equations is additionally constrained by (1) defining a range for concentration ... |
author2 |
Aquapôle - ULiège |
format |
Conference Object |
author |
Peeters, Luk Batelaan, Okke Dassargues, Alain |
author_facet |
Peeters, Luk Batelaan, Okke Dassargues, Alain |
author_sort |
Peeters, Luk |
title |
Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling |
title_short |
Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling |
title_full |
Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling |
title_fullStr |
Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling |
title_full_unstemmed |
Identification and quantification of sources of major solutes in a sandy, phreatic aquifer in Central Belgium through ionic ratios and geochemical mass-balance modelling |
title_sort |
identification and quantification of sources of major solutes in a sandy, phreatic aquifer in central belgium through ionic ratios and geochemical mass-balance modelling |
publishDate |
2007 |
url |
https://orbi.uliege.be/handle/2268/3587 https://orbi.uliege.be/bitstream/2268/3587/1/publi159-2007.pdf |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Groundwater and Ecosystems, Proc. of the XXXV IAH Congress (2007); XXXV IAH Congress (International Association of Hydrogeologists), Lisboa, Portugal [PT], 2007 |
op_relation |
https://orbi.uliege.be/handle/2268/3587 info:hdl:2268/3587 https://orbi.uliege.be/bitstream/2268/3587/1/publi159-2007.pdf |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
_version_ |
1796940283818016768 |