4.7 Article

The lake as an iron sink - new insights on the role of iron speciation

期刊

CHEMICAL GEOLOGY
卷 584, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.chemgeo.2021.120529

关键词

Iron biogeochemistry; X-ray absorption spectroscopy; Browning; Organic carbon; Mass balance

资金

  1. Swedish Research Council [2015-05450, 2016-04561]
  2. Formas [9422015-14]
  3. Knut and Alice Wallenberg Foundation [2013.0073]
  4. U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
  5. DOE Office of Biological and Environmental Research
  6. National Institutes of Health, National Institute of General Medical Sciences [P41GM103393]
  7. Swedish Research Council [2015-05450] Funding Source: Swedish Research Council

向作者/读者索取更多资源

This study found that Lake Bolmen mainly serves as a sink for iron from mineral sources, and increasing precipitation may lead to higher iron loading to lakes, resulting in enhanced iron sequestration in sediments.
The solubility and behavior of iron (Fe) in natural waters is tightly linked to Fe speciation, and Fe speciation likely influences how Fe distributes between the water column and sediments. In this study, the function of a lake as an Fe sink, with focus on the role of Fe speciation, was assessed for Lake Bolmen in southern Sweden. We found that a large fraction of the Fe flowing in to the lake was efficiently lost by sedimentation in the lake basin. Fe in inflowing water was a mix of organically complexed mononuclear Fe, Fe-(oxy)hydroxides and Fe-bearing clays, while surface sediments were composed of Fe-(oxy)hydroxides, Fe-bearing clays, Fe-bearing silicates and Fe sulfides. The absence of organically complexed Fe in the surface sediments indicates that the lake is mainly a sink for minemgenic fractions. Furthermore, while lakes are considered to be sinks of Fe, it has been suggested that this function may be impaired by increasing precipitation and consequently shorter water residence time. In this study there were large within- and between-year variations in precipitation and Fe concentrations. However, rather than smaller Fe losses to the sediments during wet years, within-lake losses tended to be larger due to higher loading of Fe from the catchment. Thus, forecasted increases in precipitation may result in enhanced catchment export and Fe loading to lakes, and subsequently enhanced Fe sequestration in sediments.

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