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Application of the isotope pairing technique in sediments: use, challenges and new directions.

Journal article
Authors Elizabeth Robertson
Marco Bartoli
Volker Brüchert
Tage Dalsgaard
Per Hall
Dana Hellemann
Susanna Hietanen
Mindaugas Zilius
Daniel J Conley
Published in Limnology and Oceanography : Methods
Volume 17
Issue 2
Pages 112-136
ISSN 1541-5856
Publication year 2019
Published at Department of marine sciences
Pages 112-136
Language en
Links doi.org/10.1002/lom3.10303
Subject categories Biological Sciences, Chemical Sciences, Earth and Related Environmental Sciences

Abstract

Determining accurate rates of benthic nitrogen (N) removal and retention pathways from diverse environments is critical to our understanding of process distribution and constructing reliable N budgets and models. The whole‐core 15N isotope pairing technique (IPT) is one of the most widely used methods to determine rates of benthic nitrate‐reducing processes and has provided valuable information on processes and factors controlling N removal and retention in aquatic systems. While the whole core IPT has been employed in a range of environments, a number of methodological and environmental factors may lead to the generation of inaccurate data and are important to acknowledge for those applying the method. In this review, we summarize the current state of the whole core IPT and highlight some of the important steps and considerations when employing the technique. We discuss environmental parameters which can pose issues to the application of the IPT and may lead to experimental artifacts, several of which are of particular importance in environments heavily impacted by eutrophication. Finally, we highlight the advances in the use of the whole‐core IPT in combination with other methods, discuss new potential areas of consideration and encourage careful and considered use of the whole‐core IPT. With the recognition of potential issues and proper use, the whole‐core IPT will undoubtedly continue to develop, improve our understanding of benthic N cycling and allow more reliable budgets and predictions to be made.

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