Rare earth elements as tracers of active colloidal organic matter composition
Charlotte Catrouillet
A B , Héléne Guenet A , Anne-Catherine Pierson-Wickmann A , Aline Dia A , Martine Bouhnik LeCoz A , Sarah Deville A , Quentin Lenne A , Yasushi Suko A and Mélanie Davranche A
+ Author Affiliations
- Author Affiliations
A Géosciences Rennes UMR 6118, University of Rennes 1, CNRS, 35042 Rennes cedex, France.
B Corresponding author. Email: charlotte.catrouillet@univ-rennes1.fr
Environmental Chemistry 17(2) 133-139 https://doi.org/10.1071/EN19159
Submitted: 29 May 2019 Accepted: 16 October 2019 Published: 4 December 2019
Environmental context. The origin of organic matter at Earth’s continental surface can be either terrestrial or microbial, and its precise composition can influence its reactivity towards metals. We investigated the potential of rare earth elements to fingerprint the origin of various organic matters through their reactivity and composition. The rare earth element patterns can be useful tools to determine the reactivity and also pristine source of natural organic matter.
Abstract. Rare earth elements (REEs) have been shown to be efficient tracers of the functional sites and/or complexes formed on humic molecules. In the present study, we test the potential of REEs to be used as tracers of the sources of humic substances (HSs). Three types of organic matter (OM) of terrestrial and microbiological origin were tested. The experiments of REEs binding to the HSs were combined with size-fractionation experiments. The REE patterns were the most fractionated in the <10 kDa fraction. For Leonardite humic acid (LHA) and Aldrich humic acid (AHA), the REE patterns were consistent with the REEs binding to strong but low density sites for a low REE/C loading. By contrast, for Pony Lake fulvic acid (PLFA), the REE pattern was similar to the REE pattern developed onto a bacteria cell surface and was attributed to the REEs binding to phosphate surface sites. Fluorescence and elemental analysis of PLFA showed that the <10 kDa fraction was the fraction with the stronger microbiological character, which suggested the REEs were probably bound to PLFA through REE-phosphate complexes. Such results therefore provide a new possibility for the use of REEs to assess an OM source without the need to perform numerous or complex analytical methodologies.
Additional keywords: organic matter, patterns, rare earth elements, size fractionation, tracer.
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