Biogenic Fenton process : A possible mechanism for the mineralization of organic carbon in fresh waters
Vähätalo, A. V., Xiao, Y., & Salonen, K. (2021). Biogenic Fenton process : A possible mechanism for the mineralization of organic carbon in fresh waters. Water Research, 188, Article 116483. https://doi.org/10.1016/j.watres.2020.116483
Published in
Water ResearchDate
2021Copyright
© 2020 Elsevier Ltd. All rights reserved.
To explore the mechanisms that mineralize poorly bioavailable natural organic carbon (OC), we measured the mineralization of OC in two lake waters over long-term experiments (up to 623 days) at different pH and iron (Fe) levels. Both the microbial and photochemical mineralization of OC was higher at pH acidified to 4 than at the ambient pH 5 or an elevated pH 6. During 244 days, microbes mineralized up to 60% of OC in the 10-µm filtrates of lake water and more than 27% in the 1-µm filtrates indicating that large-sized microbes/grazers enhance the mineralization of OC. A reactivity continuum model indicated that the acidification stimulated the microbial mineralization of OC especially in the later (>weeks) phases of experiment when the bioavailability of OC was poor. The reactive oxygen species produced by light or microbial metabolism could have contributed to the mineralization of poorly bioavailable OC through photochemical and biogenic Fenton processes catalyzed by the indigenous Fe in lake water. When Fe was introduced to artificial lake water to the concentration found in the study lakes, it increased the densities of bacteria growing on solid phase extracted dissolved organic matter and in a larger extent at low pH 4 than at pH 5. Our results suggest that in addition to the photochemical Fenton process (photo-Fenton), microbes can transfer poorly bioavailable OC into labile forms and CO2 through extracellular Fe-catalyzed reactions (i.e., biogenic Fenton process).
...
Publisher
ElsevierISSN Search the Publication Forum
0043-1354Keywords
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/43405902
Metadata
Show full item recordCollections
Related funder(s)
Research Council of FinlandFunding program(s)
Postdoctoral Researcher, AoFAdditional information about funding
This study was supported by the Academy of Finland Grant (No. 295709), the Taishan Scholar Foundation of Shandong Province (No. tsqn201909126), the Commission of European Communities (No. STEP-CT90-0112) and the CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, YICCAS (No. 2020KFJJ12).License
Related items
Showing items with similar title or keywords.
-
Sunlit surface waters : exploring the photochemical reactivity of dissolved organic carbon
Gu, Yufei (University of Jyväskylä, 2017)In surface waters, solar radiation can photochemically mineralise the dissolved organic carbon (DOC, a measure of dissolved organic matter, DOM) to dissolved inorganic carbon (DIC). This DIC photoproduction constitutes ... -
Environmental controls on benthic food web functions and carbon resource use in subarctic lakes
Kivilä, Henriikka; Luoto, Tomi P.; Rantala, Marttiina V.; Kiljunen, Mikko; Rautio, Milla; Nevalainen, Liisa (Wiley-Blackwell Publishing Ltd., 2019)Climate warming and consequent greening of subarctic landscapes increase the availability of organic carbon to the detrital food webs in aquatic ecosystems. This may cause important shifts in ecosystem functioning through ... -
Integrating Decomposers, Methane-Cycling Microbes and Ecosystem Carbon Fluxes Along a Peatland Successional Gradient in a Land Uplift Region
Juottonen, Heli; Kieman, Mirkka; Fritze, Hannu; Hamberg, Leena; Laine, Anna M.; Merilä, Päivi; Peltoniemi, Krista; Putkinen, Anuliina; Tuittila, Eeva-Stiina (Springer Science+Business Media, 2022)Peatlands are carbon dioxide (CO2) sinks that, in parallel, release methane (CH4). The peatland carbon (C) balance depends on the interplay of decomposer and CH4-cycling microbes, vegetation, and environmental conditions. ... -
Coupling of iron and dissolved organic matter in lakes–selective retention of different size fractions
Riise, Gunnhild; Haaland, Ståle Leif; Xiao, Yihua (Springer, 2023)Increasing concentration of iron (Fe) is observed in many boreal lakes, such as for the present study in Oslo Østmark, SE-Norway (1983–2018). As Fe-regulating processes are complex and dynamic, the link between mobilizing ... -
High organic carbon content constricts the potential for stable organic carbon accrual in mineral agricultural soils in Finland
Soinne, Helena; Hyyrynen, Matti; Jokubė, Medilė; Keskinen, Riikka; Hyväluoma, Jari; Pihlainen, Sampo; Hyytiäinen, Kari; Miettinen, Arttu; Rasa, Kimmo; Lemola, Riitta; Virtanen, Eetu; Heinonsalo, Jussi; Heikkinen, Jaakko (Elsevier, 2024)Sequestering carbon into agricultural soils is considered as a means of mitigating climate change. We used agronomic soil test results representing c. 95% of the farmed land area in Finland to estimate the potential of the ...