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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Nanoscale lignin particles as sources of dissolved iron to the ocean
Global Biogeochemical Cycles, Volume 26, No. 3, Article GB3024, Year 2012
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Description
[1] Primary production in large areas of the open ocean is limited by low iron concentrations. Rivers are potential sources of iron to the ocean, however, riverine iron is prone to intense flocculation and sedimentation in the estuarine mixing zone. Here we report the detection of iron-rich nanoparticles in a typical peatland-draining creek which are resistant against salt-induced flocculation i.e., their behavior is in sharp contrast to the well-known behavior of Fe colloids in river waters. Sample fractionation by AsFlFFF (Asymmetric Flow Field Flow Fractionation) revealed that these powerful iron carriers are in the size range of only 0.5-3.0 nm hydrodynamic diameter. They were isolated from the water phase using solid phase extraction/gel permeation chromatography, and analyzed by a CuO oxidation/GC-MS method. Our results suggest that the particles consist mainly of lignin catabolites and that gymnosperm as well as angiosperm tissues are contributors to the seawater-resistant iron-bearing DOM. Lignin phenols, which have no autochthonous source in the ocean, have been nevertheless found in low concentrations throughout the entire Arctic, Atlantic, and Pacific oceans. It is therefore tempting to speculate that peatland-derived iron-bearing lignin particles may have a sufficiently long half-life in ocean waters to sustain iron concentration in extended regions of the ocean. © 2012. American Geophysical Union. All Rights Reserved.
Authors & Co-Authors
Krachler, Regina
Austria, Vienna
Universität Wien
Jirsa, Franz
Austria, Vienna
Universität Wien
Krachler, Rudolf F.
Austria, Vienna
Universität Wien
Plessl, Christof
Austria, Vienna
Universität Wien
Keppler, Bernhard K.
Austria, Vienna
Universität Wien
Hofmann, Thilo
Austria, Vienna
Universität Wien
Statistics
Citations: 52
Authors: 6
Affiliations: 1
Identifiers
Doi:
10.1029/2012GB004294
ISSN:
08866236
Research Areas
Environmental