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Ubiquitous presence of Fe(II) in aquatic colloids and its association with organic carbon

Citation

von der Heyden, BP and Hauser, EJ and Mishra, B and Martinez, GA and Bowie, AR and Tyliszczak, T and Mtshali, TN and Roychoudhury, AN and Myneni, SCB, Ubiquitous presence of Fe(II) in aquatic colloids and its association with organic carbon, Environmental Science and Technology Letters, 1, (10) pp. 387-392. ISSN 2328-8930 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 American Chemical Society

DOI: doi:10.1021/ez500164v

Abstract

Despite being thermodynamically less stable, small ferrous colloids (60 nm to 3 μm in diameter) remain an important component of the biogeochemical cycle at the Earth’s surface, yet their composition and structure and the reasons for their persistence are still poorly understood. Here we use X-ray-based Fe L-edge and carbon K-edge spectromicroscopy to address the speciation and organic–mineral associations of ferrous, ferric, and Fe-poor particles collected from sampling sites in both marine and freshwater environments. We show that Fe(II)-rich phases are prevalent throughout different aquatic regimes yet exhibit a high degree of chemical heterogeneity. Furthermore, we show that Fe-rich particles show strong associations with organic carbon. The observed association of Fe(II) particles with carboxamide functional groups suggests a possible microbial role in the preservation of Fe(II). These finding have significant implications for the behavior of Fe(II) colloids in oxygenated waters, and their role in different aquatic biogeochemical processes.

Item Details

Item Type:Refereed Article
Keywords:iron(ii), aquatic, colloids, organic carbon
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Bowie, AR (Associate Professor Andrew Bowie)
ID Code:98184
Year Published:2014
Web of Science® Times Cited:5
Deposited By:IMAS Research and Education Centre
Deposited On:2015-02-04
Last Modified:2017-11-06
Downloads:0

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