Document Detail

Nitrate degradation without 15N enrichment: a hydrochemical and isotopic study of a fractured rock aquifer including embedded lakes.
MedLine Citation:
PMID:  16870560     Owner:  NLM     Status:  MEDLINE    
Water samples from three quarry lakes and the surrounding fractured rock aquifer were investigated for delta18O and delta2H (H2O), delta15N and delta18O (NO3-), as well as anions and cations. Lake water and groundwater can be distinguished by their different chemical and isotopic composition. Because of evaporation processes, 18O and 2H are enriched in the lake water and can be used as natural tracers for the water dynamic of the lakes. The groundwater is characterised by high nitrate concentrations (up to 120 mg/l). Lake internal processes reduce the nitrate concentration in the quarry lakes. However, no enrichment of delta15N and delta18O in nitrate, typical for microbial nitrate degradation, is observed in the lake water. Because of the complex flow paths in the fractured rock aquifer and the intense chemical transformations at the interface between groundwater and lake water, isotopic and hydrochemical data of lake water and groundwater alone do not conclusively explain hydrological and hydrochemical processes of the investigated lake-groundwater system.
Elke Bozau; Kay Knöller; Gerhard Strauch
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  42     ISSN:  1025-6016     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-07-27     Completed Date:  2007-01-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  England    
Other Details:
Languages:  eng     Pagination:  251-60     Citation Subset:  IM    
Department Lake Research, UFZ Centre for Environmental Research Leipzig-Halle, Brückstr. 3a, 39114, Magdeburg, Germany.
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MeSH Terms
Deuterium / analysis
Fresh Water / chemistry*
Nitrates / analysis*
Nitrogen Isotopes / analysis*
Oxygen Isotopes / analysis
Reg. No./Substance:
0/Nitrates; 0/Nitrogen Isotopes; 0/Oxygen Isotopes; 7782-39-0/Deuterium

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