dot
Detailansicht
Katalogkarte GBA
Katalogkarte ISBD
Suche präzisieren
Drucken
Download RIS
Hier klicken, um den Treffer aus der Auswahl zu entfernen
Titel Tracing atmospheric nitrate in groundwater using triple oxygen isotopes: evaluation based on bottled drinking water
VerfasserIn F. Nakagawa, A. Suzuki, S. Daita, T. Ohyama, D. D. Komatsu, U. Tsunogai
Medientyp Artikel
Sprache Englisch
ISSN 1726-4170
Digitales Dokument URL
Erschienen In: Biogeosciences ; 10, no. 6 ; Nr. 10, no. 6 (2013-06-03), S.3547-3558
Datensatznummer 250018269
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/bg-10-3547-2013.pdf
 
Zusammenfassung
The stable isotopic compositions of nitrate dissolved in 49 brands of bottled drinking water collected worldwide were measured, to trace the fate of atmospheric nitrate (NO3 atm) that had been deposited into subaerial ecosystems, using the 17O anomalies (Δ17O) of nitrate as tracers. The use of bottled water enables collection of groundwater recharged at natural, background watersheds. The nitrate in groundwater had small Δ17O values ranging from −0.2‰ to +4.5‰ n = 49). The average Δ17O value and average mixing ratio of atmospheric nitrate to total nitrate in the groundwater samples were estimated to be 0.8‰ and 3.1%, respectively. These findings indicated that the majority of atmospheric nitrate had undergone biological processing before being exported from the surface ecosystem to the groundwater. Moreover, the concentrations of atmospheric nitrate were estimated to range from less than 0.1 μmol L−1 to 8.5 μmol L−1 with higher NO3atm concentrations being obtained for those recharged in rocky, arid or elevated areas with little vegetation and lower NO3atm concentrations being obtained for those recharged in forested areas with high levels of vegetation. Additionally, many of the NO3atm-depleted samples were characterized by elevated δ15N values of more than +10‰. Uptake by plants and/or microbes in forested soils subsequent to deposition and the progress of denitrification within groundwater likely plays a significant role in the removal of NO3atm.
 
Teil von