Formation of iron oxyhydroxides as a result of glauconite weathering in soils of temperate climate

Makiel, Magdalena; Skiba, Michał; Kisiel, Marta; Maj-Szeliga, Katarzyna; Błachowski, A.; Szymański, Wojciech; Salata, Dorota

doi:10.1016/j.geoderma.2022.115780

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…Notably, the anionic forms (-O − or -COO − ) of HS functionalities (phenolic OH and carboxylic acid-COOH, respectively) would be favored in donating π-electrons to Fe 3+ d-orbitals due the high availability of Fe 3+ before reaching the saturation state during its addition in the precipitation process. The achieved Fe-DOM P might be comparable with both Fe-(oxy)hydroxides (FeOOH) in either dissolved or colloidal state in water 31,52,[93][94][95] , and Fe-(oxy)hydroxide minerals and organo-mineral complexes in soils and sediments 10,12,13,[96][97][98][99][100][101] . In particular, Fe-DOM P would include, besides organo-Fe(OH) 3 complexes, also organo-Fe(III) oxyhydroxides and organo-Fe(III) minerals 102 .…”

Section: Elemental Compositionmentioning

confidence: 91%

“…2). This would imply that Fe-HA P /Fe-FA P , similarly to Fe-(oxy)hydroxide minerals and organomineral complexes, can stabilize SOM in soils and sediments 10,12,13,74,[96][97][98][99][100][101]112 . The existence of strong complexes of HA/FA in Fe-DOM P is further supported by a recent study showing that Fe (oxy)hydroxides generally exert a stronger impact on SOC storage and stabilization than aluminous clays 112 .…”

Section: Elemental Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Isolation of dissolved organic matter from aqueous solution by precipitation with FeCl3: mechanisms and significance in environmental perspectives

Zhang

Mostofa

Yang

et al. 2023

Sci Rep

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Ferric ions can bind strongly with dissolved organic matter (DOM), including humic acids (HA), fulvic acids (FA), and protein-like substances, whereas isolation of Fe-DOM precipitates (Fe-DOMP) and their biochemical characteristics remain unclear. In this work FeCl3 was used to isolate DOM components from various sources, including river, lake, soil, cow dung, and standard tryptophan and tyrosine, through precipitation at pH 7.5–8.5. The Fe-DOMP contribute to total DOM by approximately 38.6–93.8% of FA, 76.2% of HA and 25.0–30.4% of tryptophan and tyrosine, whilst fluorescence spectra allowed to monitor/discriminate the various DOM fractions in the samples. The relative intensity of the main infrared peaks such as 3406‒3383 cm−1 (aromatic OH), 1689‒1635 cm−1 (‒COOH), 1523–1504 cm−1 (amide) and 1176–1033 cm−1 (‒S=O) show either to decline or disappear in Fe‒DOMP. These results suggest the occurrence of Fe bonds with various functional groups of DOM, indicating the formation of π–d electron bonding systems of different strengths in Fe‒DOMP. The novel method used for isolation of Fe-DOMP shows promising in opening a new frontier both at laboratory and industrial purposes. Furthermore, results obtained may provide a better understanding of metal–organic complexes involved in the regulation of the long-term stabilization/sequestration of DOM in soils and waters.

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