Fate of organic compounds during transformation of ferrihydrite in iron formations

Research output: Contribution to journalJournal articleResearchpeer-review

Standard

Fate of organic compounds during transformation of ferrihydrite in iron formations. / Jelavic, Stanislav; Mitchell, Andrew C.; Sand, Karina Krarup.

In: Geochemical Perspectives Letters, Vol. 15, 15.09.2020, p. 25-29.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Jelavic, S, Mitchell, AC & Sand, KK 2020, 'Fate of organic compounds during transformation of ferrihydrite in iron formations', Geochemical Perspectives Letters, vol. 15, pp. 25-29. https://doi.org/10.7185/geochemlet.2030

APA

Jelavic, S., Mitchell, A. C., & Sand, K. K. (2020). Fate of organic compounds during transformation of ferrihydrite in iron formations. Geochemical Perspectives Letters, 15, 25-29. https://doi.org/10.7185/geochemlet.2030

Vancouver

Jelavic S, Mitchell AC, Sand KK. Fate of organic compounds during transformation of ferrihydrite in iron formations. Geochemical Perspectives Letters. 2020 Sep 15;15:25-29. https://doi.org/10.7185/geochemlet.2030

Author

Jelavic, Stanislav ; Mitchell, Andrew C. ; Sand, Karina Krarup. / Fate of organic compounds during transformation of ferrihydrite in iron formations. In: Geochemical Perspectives Letters. 2020 ; Vol. 15. pp. 25-29.

Bibtex

@article{1648e8cd30a148539bcc81f80832c8e7,
title = "Fate of organic compounds during transformation of ferrihydrite in iron formations",
abstract = "The absence of organic compounds from Precambrian iron formations (IF) challenges the hypothesis of the biogenic origin of IF. Here we address the fate of adsorbed organic compounds during transformation from ferrihydrite to hematite. We determined the binding energy between hematite and common molecular terminations found in extracellular polymeric substances and biofilms: carboxylic, hydroxyl and phosphate functional groups. We found that the bond between hematite and hydroxyl groups is approximately 2 times stronger than the bond between hematite-carboxyl and -phosphate groups. We transformed synthetic ferrihydrite to hematite at 90 ºC in presence of glycerol, which has a high density of hydroxyl groups and measured the amount of mineral associated glycerol before and after the transformation. We show that the transformation releases glycerol highlighting that organic compounds adsorbed at precursor ferrihydrite could be desorbed already during the process of IF sedimentation and diagenesis. Our results suggest that the absence of organic compounds in IF should not be used as evidence against their biogenic origin.",
author = "Stanislav Jelavic and Mitchell, {Andrew C.} and Sand, {Karina Krarup}",
year = "2020",
month = "9",
day = "15",
doi = "10.7185/geochemlet.2030",
language = "English",
volume = "15",
pages = "25--29",
journal = "Geochemical Perspectives Letters",
issn = "2410-3403",
publisher = "European Association of Geochemistry",

}

RIS

TY - JOUR

T1 - Fate of organic compounds during transformation of ferrihydrite in iron formations

AU - Jelavic, Stanislav

AU - Mitchell, Andrew C.

AU - Sand, Karina Krarup

PY - 2020/9/15

Y1 - 2020/9/15

N2 - The absence of organic compounds from Precambrian iron formations (IF) challenges the hypothesis of the biogenic origin of IF. Here we address the fate of adsorbed organic compounds during transformation from ferrihydrite to hematite. We determined the binding energy between hematite and common molecular terminations found in extracellular polymeric substances and biofilms: carboxylic, hydroxyl and phosphate functional groups. We found that the bond between hematite and hydroxyl groups is approximately 2 times stronger than the bond between hematite-carboxyl and -phosphate groups. We transformed synthetic ferrihydrite to hematite at 90 ºC in presence of glycerol, which has a high density of hydroxyl groups and measured the amount of mineral associated glycerol before and after the transformation. We show that the transformation releases glycerol highlighting that organic compounds adsorbed at precursor ferrihydrite could be desorbed already during the process of IF sedimentation and diagenesis. Our results suggest that the absence of organic compounds in IF should not be used as evidence against their biogenic origin.

AB - The absence of organic compounds from Precambrian iron formations (IF) challenges the hypothesis of the biogenic origin of IF. Here we address the fate of adsorbed organic compounds during transformation from ferrihydrite to hematite. We determined the binding energy between hematite and common molecular terminations found in extracellular polymeric substances and biofilms: carboxylic, hydroxyl and phosphate functional groups. We found that the bond between hematite and hydroxyl groups is approximately 2 times stronger than the bond between hematite-carboxyl and -phosphate groups. We transformed synthetic ferrihydrite to hematite at 90 ºC in presence of glycerol, which has a high density of hydroxyl groups and measured the amount of mineral associated glycerol before and after the transformation. We show that the transformation releases glycerol highlighting that organic compounds adsorbed at precursor ferrihydrite could be desorbed already during the process of IF sedimentation and diagenesis. Our results suggest that the absence of organic compounds in IF should not be used as evidence against their biogenic origin.

U2 - 10.7185/geochemlet.2030

DO - 10.7185/geochemlet.2030

M3 - Journal article

VL - 15

SP - 25

EP - 29

JO - Geochemical Perspectives Letters

JF - Geochemical Perspectives Letters

SN - 2410-3403

ER -

ID: 247029838