Articles | Volume 18, issue 11
Biogeosciences, 18, 3445–3465, 2021
https://doi.org/10.5194/bg-18-3445-2021
Biogeosciences, 18, 3445–3465, 2021
https://doi.org/10.5194/bg-18-3445-2021

Research article 10 Jun 2021

Research article | 10 Jun 2021

Mercury mobility, colloid formation and methylation in a polluted Fluvisol as affected by manure application and flooding–draining cycle

Lorenz Gfeller et al.

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Cited articles

Abgottspon, F., Bigalke, M., and Wilcke, W.: Fast colloidal and dissolved release of trace elements in a carbonatic soil after experimental flooding, Geoderma, 259–260, 156–163, https://doi.org/10.1016/j.geoderma.2015.06.005, 2015. 
Aiken, G. R., Hsu-Kim, H., and Ryan, J. N.: Influence of dissolved organic matter on the environmental fate of metals, nanoparticles, and colloids, Environ. Sci. Technol., 45, 3196–3201, https://doi.org/10.1021/es103992s, 2011. 
Åkerblom, S., Meili, M., Bringmark, L., Johansson, K., Kleja, D. B., and Bergkvist, B.: Partitioning of Hg Between Solid and Dissolved Organic Matter in the Humus Layer of Boreal Forests, Water Air Soil Poll., 189, 239–252, https://doi.org/10.1007/s11270-007-9571-1, 2008. 
Allard, B. and Arsenie, I.: Abiotic reduction of mercury by humic substances in aquatic system: An important process for the mercury cycle, Water Air Soil Poll., 56, 457–464, https://doi.org/10.1007/BF00342291, 1991. 
AMAP/UN Environment: Technical Background Report for the Global Mercury Assessment 2018, Arctic Monitoring and Assessment Programme, Oslo, Norway, UN Environment Programme, Chemicals and Health Branch, Geneva, Switzerland, 426 pp., 2019. 
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Our incubation experiment shows that flooding of polluted floodplain soils may induce pulses of both mercury (Hg) and methylmercury to the soil solution and threaten downstream ecosystems. We demonstrate that mobilization of Hg bound to manganese oxides is a relevant process in organic-matter-poor soils. Addition of organic amendments accelerates this mobilization but also facilitates the formation of nanoparticulate Hg and the subsequent fixation of Hg from soil solution to the soil.
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