Articles | Volume 22, issue 7
Research article
30 Jul 2018
Research article |  | 30 Jul 2018

Nitrogen attenuation, dilution and recycling in the intertidal hyporheic zone of a subtropical estuary

Sébastien Lamontagne, Frédéric Cosme, Andrew Minard, and Andrew Holloway

Related subject area

Subject: Biogeochemical processes | Techniques and Approaches: Instruments and observation techniques
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Cited articles

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Benson, S. J., Lennard, C. J., Maynard, P., Hill, D. M., Andrew, A. S., and Roux, C.: Forensic analysis of explosives using isotope ratio mass spectrometry (IRMS) – Discrimination of ammonium nitrate sources, Sci. Justice, 49, 73–80,, 2009. 
Bottcher, J., Strebel, O., Voerkelius, S., and Schmidt, H. L.: Using Isotope Fractionation of Nitrate Nitrogen and Nitrate Oxygen for Evaluation of Microbial Denitrification in a Sandy Aquifer, J. Hydrol., 114, 413–424,, 1990. 
Short summary
The dual nitrate isotope technique is one of the most commonly used approaches to study the origin and fate of N introduced in aquifers. In this study, we first demonstrate a large attenuation of groundwater N at a former industrial site, especially at the interface between surface and groundwater. We also provide evidence for a switch in the oxygen isotopic signature of groundwater due to this extensive N attenuation. This could be used to better quantify N attenuation processes in aquifers.