Universität zu Köln

Dorau, Kristof, Pohl, Lydia, Just, Christopher, Hoeschen, Carmen, Ufer, Kristian, Mansfeldt, Tim ORCID: 0000-0002-7557-6827 and Mueller, Carsten W. ORCID: 0000-0003-4119-0544 (2019). Soil Organic Matter and Phosphate Sorption on Natural and Synthetic Fe Oxides under in Situ Conditions. Environ. Sci. Technol., 53 (22). S. 13081 - 13088. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5851

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Abstract

Iron (Fe) oxides in soils are strong sorbents for environmentally important compounds like soil organic matter (SOM) or phosphate, while sorption under field conditions is still poorly understood. We installed polyvinyl chloride plastic bars which have been coated either with synthetic Fe or manganese (Mn) oxides for 30 days in a redoximorphic soil. A previous study revealed the formation of newly formed (natural) Fe oxides along the Mn oxide coatings. This enables us to differentiate between sorption occurring onto the surfaces of synthetic versus natural Fe oxides. After removal of the bars, they were analyzed by nanoscale secondary ion mass spectrometry (NanoSIMS) to study the distribution of Fe ((FeO-)-Fe-56-O-16) SOM ((CN-)-C-12-N-14), and phosphorus ((PO2-)-P-31-O-16) at the microscale. Image analysis of individual Fe oxide particles revealed a close association of Fe, SOM, and P resulting in coverage values up to 71%. Furthermore, ion ratios between sorbent ((FeO-)-Fe-56-O-16) and sorbate ((CN-)-C-12-N-14 and (PO2-)-P-31-O-16 ) were smaller along the natural oxides when compared with those for synthetic Fe oxides. We conclude that both natural and synthetic Fe oxides rapidly sequester SOM and P (i.e., within 30 days) but that newly, natural formed Fe oxides sorbe more SOM and P than synthetic Fe oxides.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dorau, Kristof UNSPECIFIED UNSPECIFIED UNSPECIFIED Pohl, Lydia UNSPECIFIED UNSPECIFIED UNSPECIFIED Just, Christopher UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoeschen, Carmen UNSPECIFIED UNSPECIFIED UNSPECIFIED Ufer, Kristian UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansfeldt, Tim UNSPECIFIED orcid.org/0000-0002-7557-6827 UNSPECIFIED Mueller, Carsten W. UNSPECIFIED orcid.org/0000-0003-4119-0544 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-127415
DOI:	10.1021/acs.est.9b03260
Journal or Publication Title:	Environ. Sci. Technol.
Volume:	53
Number:	22
Page Range:	S. 13081 - 13088
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-5851
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Geographisches Institut
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COATED REDOX BARS; IRON-OXIDES; MINERAL SURFACES; REDUCTION; NANOSIMS; STABILIZATION; MANGANESE; TOOL; FERRIHYDRITE; ASSOCIATIONS Multiple languages Engineering, Environmental; Environmental Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12741