Eschenbach, Wolfram and Well, Reinhard and Flessa, Heiner and Walther, Wolfgang and Duijnisveld, Wilhelmus .H.M.
(2009)
Development of a method for in situ measurement of denitrification in aquifers using 15N tracer tests and membrane inlet mass spectrometry.
In: Jahrestagung der DBG 2009: Böden - eine endliche Ressource, September 2009, Bonn.
Abstract
We present a new approach for in situ-measurement of denitrification using a combination of 15N-tracer push-pull experiments with in situ analysis of 15N-labled N2 and N2O using membrane inlet mass spectrometry (MIMS).
In the 15N-tracer experiment we present here we supplemented Aquifer material of two depths with 15N labeled nitrate.
The results of our laboratory 15N-tracer test showed a linear increase of denitrification products (15(N2O+N2)) over time. At the end of our experiment we measured up to 1500 and 3700 µg/L 15(N2O+N2) in the water samples from the supplemented aquifer material. The online measurement with MIMS enabled us to see during the experiment if and when the production of the labeled denitrification products started.
We took also parallel samples for isotope ratio mass spectrometry (IRMS) analysis to check our MIMS measurements. The measured 15(N2O+N2) values for IRMS matches the MIMS measurements very well.
With the MIMS-method there is no need for sample preparation and so we were able to run the MIMS part of the 15N-tracer test automatically. Later-on this approach will be used in the field.
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