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Sterols in soil organic matter of sandy arable soils: Quantification using mass spectrometry and their relation to mineralizability of soil organic N

Heumann, Sabine and Schlichting, Andre and Swain, Eleanor and Abbott, Geoffry D. and Rimmer, David and Leinweber, Peter and Böttcher, Jürgen (2011) Sterols in soil organic matter of sandy arable soils: Quantification using mass spectrometry and their relation to mineralizability of soil organic N. In: Böden verstehen - Böden nutzen - Böden fit machen, 3. - 9. September 2011, Berlin.

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Abstract

Lately, a significant negative correlation between proportions of the compound class of sterols from pyrolysis-field ionization mass spectrometry (Py-FIMS) and net N mineralizability of soil organic N was found. However, main plant sterols (?-Sitosterol, Stigmasterol, and Campesterol) cannot be clearly verified and quantified with Py-FIMS, and there are only very few studies on measuring concentrations in soils. Thus, the objective was the extraction, identification and quantification of typical plant sterols and their relation to net N mineralization rates. The three sterols were identified and quantified in lipid extracts (Soxhlet procedure) using gas chromatography - mass spectrometry (GC-MS). Concentrations were similar to few other available studies, but concentrations of the three sterols were not significantly correlated with net N mineralizability. As quantification was difficult due to co-elution, further optimization of the methodology is necessary. In addition, the underlying mechanisms also need to be clarified.

Item Type: Conference or Workshop Item (Contribution to "Reports of the DBG")
Uncontrolled Keywords: ?-Sitosterol, Stigmasterol, Cam-pesterol, GC-MS, long-term lab incubation
Divisions: Kommissionen > Kommission II: Bodenchemie
Depositing User: Sabine Heumann
Date Deposited: 29 Sep 2011 14:31
Last Modified: 13 Dec 2015 16:25
URI: http://eprints.dbges.de/id/eprint/560

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