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Vreča, Polona; Nagode, Klara; Kanduč, Tjaša; Lojen, Sonja; Šlejkovec, Zdenka; Žigon, Stojan; Močnik, Nika; Bračič Železnik, Branka; Jamnik, Brigita; Žitnik, Marjetka (2020): Multi-isotope characterization of water resources for domestic supply in Ljubljana, Slovenia. PANGAEA,

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The Ljubljansko polje and Ljubljansko barje aquifer system are the two most important groundwater sources for the Slovenia capital Ljubljana and its surroundings. The groundwater is pumped from 4 wellfields on Ljubljansko polje and one wellfield on Ljubljansko barje. In the central water distribution system some settlements are supplied with water from a single water plant, while some receive water from two or more facilities, depending on the volume of consumed water and pressure conditions. In Ljubljana, the water is prepared in a local water supply system without any technical water preparation procedures and is only chlorinated occasionally. Public Water Utility JP VODOVOD KANALIZACIJA SNAGA Ljubljana (JP VOKA SNAGA) monitors the microbiological and chemical parameters of drinking water at all stages. In 2018 started a new IAEA Coordinated Project F33024 "Use of Isotope Techniques for the Evaluation of Water Sources for Domestic Supply in Urban Areas" in which researchers from 16 countries worldwide participate. The Specific Slovenian Research Objectives in CRP are to improve the assessment of most important freshwater resources for domestic supply using environment isotopes, to select significant environmental isotopes for future monitoring that will enable better understanding and interpretation of water interactions important for water managers of JP VOKA SNAGA to predict the availability and quality of freshwater resources for Ljubljana domestic water supply and to develop together with JP VOKA SNAGA and CRP project partners guidelines on integrating environmental isotopes to assist water managers in the planning, designing, and management of freshwater resources for domestic supply in urban environments. Based on the synthesis of the results from previous investigations in the area and the experiences of JP VOKA SNAGA, 97 sampling sites in the Ljubljana water supply system were selected. Sampling sites were selected according to the water supply area and according to the type of sampling sites. Selection according to the type of sampling site in the water supply system includes 6 different types: wells (VD; 44 samples), joint exits from water pumping station (ZV; 7), reservoirs (VH; 23), water treatment locations (PV; 2), drinking water fountains (PIT; 13) and water tap in public buildings (PJ). Additionally, 10 sampling sites were selected including water taps in 2 public and 8 private buildings (PP) which are not included in regular monitoring of JP VOKA SNAGA. Selection according to the water supply area includes 8 different areas: 4 main water fields: Kleče (A), Hrastje (B), Brest (C), Jarški prod (D), Šentvid (E), and 4 areas where the water is mixed from two or three different supply areas: Hrastje/Jarški prod (F), Kleče/Brest (G), Kleče/Hrastje/Jarški prod (H) and Kleče/Hrastje/Brest (I2). Finally, sampling sites on River Sava (R: Brod, Črnuče, and Šentjakob) and at the outflow from wastewater treatment plant (CČN) were also selected. Sampling was performed between 06.09.2018 and 29.11.2018. This database is summarized results of in-situ measurements (water temperature and electrical conductivity) and laboratory analysis (pH, total alkalinity, the concentration of total arsenic in water, isotope composition of oxygen, hydrogen and carbon in dissolved inorganic carbon).
arsenic; domestic water supply system; isotope composition; isotopes; water chemistry; δ13CDIC; δ18O; δ2H
Related to:
Nagode, Klara; Kanduč, Tjaša; Bračič Železnik, Branka; Jamnik, Brigita; Vreča, Polona (2022): Multi-Isotope Characterization of Water in the Water Supply System of the City of Ljubljana, Slovenia. Water, 14, 2064,
Median Latitude: 46.055867 * Median Longitude: 14.513406 * South-bound Latitude: 45.959079 * West-bound Longitude: 14.411136 * North-bound Latitude: 46.136299 * East-bound Longitude: 14.734464
Date/Time Start: 2018-09-06T00:00:00 * Date/Time End: 2018-11-29T00:00:00
Ljubljana_groundwater * Latitude: 46.055867 * Longitude: 14.513406 * Date/Time Start: 2018-09-06T00:00:00 * Date/Time End: 2018-11-29T00:00:00 * Location: Ljubljana, Slovenia * Method/Device: Multiple investigations (MULT)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1LocationLocationVreča, PolonaWATER SUPPLY AREA
2LocationLocationVreča, PolonaCODE OF WATER SUPPLY AREA
3NumberNoVreča, Polona
4SiteSiteVreča, PolonaSAMPLING SITE NAME
5Location typeLoc typeVreča, PolonaTYPE OF SAMPLING SITE
7DATE/TIMEDate/TimeVreča, PolonaGeocode
8LATITUDELatitudeVreča, PolonaGeocode
9LONGITUDELongitudeVreča, PolonaGeocode
10Sample IDSample IDVreča, Polona
11Temperature, waterTemp°CVreča, Polona
12Conductivity, electricalCond electrµS/cmVreča, Polona
13pHpHVreča, Polona
14Alkalinity, totalATmmol(eq)/lVreča, PolonaTitration
15δ18O, waterδ18O H2O‰ SMOWVreča, PolonaMass spectrometryVSMOW
16δ Deuterium, waterδD H2O‰ SMOWVreča, PolonaMass spectrometryVSMOW
17δ13C, dissolved inorganic carbonδ13C DIC‰ PDBVreča, PolonaMass spectrometryVPDB
18ArsenicAsµg/lVreča, Polona
Curation Level: Enhanced curation (CurationLevelC)
1582 data points

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