Factors affecting organic matter association with iron under reducing conditions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F25%3A00641820" target="_blank" >RIV/60077344:_____/25:00641820 - isvavai.cz</a>
Alternative codes found
RIV/60076658:12310/25:43910553
Result on the web
<a href="https://link.springer.com/article/10.1007/s11368-025-04146-z" target="_blank" >https://link.springer.com/article/10.1007/s11368-025-04146-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11368-025-04146-z" target="_blank" >10.1007/s11368-025-04146-z</a>
Alternative languages
Result language
angličtina
Original language name
Factors affecting organic matter association with iron under reducing conditions
Original language description
Purpose: The stability of organic matter (OM) in freshwater sediments is largely determined by its interactions with iron (Fe) oxyhydroxides, which play a crucial role in carbon (C) and Fe cycling, and in regulating nutrient dynamics in soils and sediments. However, under anoxic conditions, different solubility patterns can be observed for reasons that are not yet fully understood. This study aims to elucidate the influence of OM source, concentration, pH, and association mechanisms (coprecipitation vs. sorption) on OM-Fe stability. Methods: Four natural OM sources (NOM) were used to form OM-Fe associations. These sources were used for coprecipitation and sorption of dissolved OM (DOM) onto Fe oxyhydroxides at pH 5 and 7. The experiment was carried out with four different DOC: Fe molar ratios. The stability of the products was evaluated by monitoring the dissolution kinetics of sodium dithionite and the release of Fe2+, dissolved organic carbon (DOC), and changes in DOM composition. Results: Coprecipitation was more efficient than sorption for DOC retention in Fe oxyhydroxides, especially at higher DOC: Fe ratios. Dissolution was about four times slower for coprecipitated OM-Fe compounds than for sorbed ones. For all NOM sources and mechanisms, amidic (proteinaceous) OM fractions were more stable, while aromatic, phenolic, and cellulosic OM were more soluble. Typha biomass showed the highest amidic fraction, while peat was the lowest. Conclusion: These results highlight the role of OM composition in OM-Fe stability and its impact on the stabilization of Fe in freshwater sediments. The trophic level of the aquatic ecosystem and the proportion of the littoral zone can significantly affect the Fe cycle.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10503 - Water resources
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Soils and Sediments
ISSN
1439-0108
e-ISSN
1614-7480
Volume of the periodical
25
Issue of the periodical within the volume
10
Country of publishing house
DE - GERMANY
Number of pages
17
Pages from-to
3117-3133
UT code for WoS article
001589968200001
EID of the result in the Scopus database
2-s2.0-105018645009