Mathematics – Logic
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1869m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 7, pp.1869-1878
Mathematics
Logic
26
Scientific paper
The use of 15 N natural isotope tracing in an aquifer contained within chalk rocks in northern France indicates that, under certain hydrogeological conditions, major denitrification occurs. At the boundary where the aquifer becomes confined, the nitrate concentrations decrease in the direction of groundwater flow accompanied by an exponential increase in 15 N (expressed in 15 N ) of the residual nitrate. This is characteristic of kinetic isotope effects, which accompany the reduction of the nitrate ion during denitrification. Hydrogeochemical and bacteriological observations confirm this process. Natural isotope tracing also permits this process to be distinguished from local dilution with nitrate-free surface water, which would entail a major drop in nitrate values without 15 N isotopic enrichment. A model is proposed to explain the relatively small observed magnitude of the isotopic fractionation effect.
Landreau Alain
Mariotti André
Simon Béatrice
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