Universität zu Köln

Rennert, Thilo ORCID: 0000-0003-1435-2157, Eusterhues, Karin ORCID: 0000-0003-1754-2298, Hiradate, Syuntaro, Breitzke, Hergen, Buntkowsky, Gerd ORCID: 0000-0003-1304-9762, Totsche, Kai U. and Mansfeldt, Tim (2014). Characterisation of Andosols from Laacher See tephra by wet-chemical and spectroscopic techniques (FTIR, Al-27-, Si-29-NMR). Chem. Geol., 363. S. 13 - 22. AMSTERDAM: ELSEVIER. ISSN 1872-6836

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Abstract

At 12,900 a BP, the eruption of the Laacher See volcano generated a new parent material for Holocene soil formation in parts of Western Germany. Weathering of these ashes commonly includes the formation of poorly crystalline minerals such as allophane, imogolite and ferrihydrite. Detection of these minerals in soil is difficult, yet an important task, because they may govern soil functions and processes, e. g., stabilisation of organic matter and nutrient availability. Therefore, we characterised three forested Andosols by a combination of wet-chemical and spectroscopic techniques including infrared and (Al-27, Si-29) nuclear magnetic resonance (NMR) spectroscopy together with X-ray diffractometry. Deconvoluting the Si-29-NMR spectra revealed that 1.6 to 10.4% of total Si was present as allophanic compounds, which coincided with the amounts of oxalate-extractable Si. Since extraction methods are not completely selective, we observed a slight overestimation of allophanic Si estimated from oxalate extraction. Although the sites under study are located close to each other in similar relief positions and with similar vegetation, the combination of our results revealed varying amounts of loess in the parent materials and varying weathering intensity. High weathering intensities correlate with the amounts of allophane. (C) 2013 Elsevier B. V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rennert, Thilo UNSPECIFIED orcid.org/0000-0003-1435-2157 UNSPECIFIED Eusterhues, Karin UNSPECIFIED orcid.org/0000-0003-1754-2298 UNSPECIFIED Hiradate, Syuntaro UNSPECIFIED UNSPECIFIED UNSPECIFIED Breitzke, Hergen UNSPECIFIED UNSPECIFIED UNSPECIFIED Buntkowsky, Gerd UNSPECIFIED orcid.org/0000-0003-1304-9762 UNSPECIFIED Totsche, Kai U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansfeldt, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-448620
DOI:	10.1016/j.chemgeo.2013.10.029
Journal or Publication Title:	Chem. Geol.
Volume:	363
Page Range:	S. 13 - 22
Date:	2014
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-6836
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ORGANIC-CARBON; MINERAL CONTROL; ALLOPHANE; PYROPHOSPHATE; SOILS; ALUMINUM; GERMANY; INDEX; RATIO; NMR Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44862