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Projekt Druckansicht

Naturally produced volatile and polar organohalogens in soils

Fachliche Zuordnung Mineralogie, Petrologie und Geochemie
Förderung Förderung von 2008 bis 2012
Projektkennung Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 24881704
 
Erstellungsjahr 2016

Zusammenfassung der Projektergebnisse

This subproject as part of the DFG Research Unit 763 investigated natural halogenation processes in water and sediment soils of hypersaline environments and minerals. The overall aims of this subproject were to further explore the formation of atmospherically-relevant halocarbons including chloromethane and bromomethane, and to study their biogeochemical cycles, in particular in semi-arid areas. Generally, we followed the project according to the research plans and most work packages could be successfully addressed. Most of our results were published in peer-reviewed journals. Part of the results from hypersaline environments especially the volatile halogenated compounds are presented from the dissertation of Krause that will be published. A new designed highly sensitive purge-and-trap GC-MS system for gases in water and soil samples was developed which could easily adapted for the measurement of gases in Fluid Inclusions of minerals. Furthermore a gas-tight grinding device was constructed for a planetary mill that after the grinding could be attached in-line to the purge-and-trap GC-MS.. Resuming the highlights from the subproject Schöler: Review of the formation mechanisms of natural organohalogens with particular attention to recent advances in biomimetic chemistry and in Fenton chemistry (together with subproject Comba). - Development of a new designed highly sensitive and highly versatile purge-and-trap GC-MS system for the analysis of a wide range (b.p from - 160 to 200 0C) of volatile organic compounds in water, soils and minerals (together with subproject Zetzsch). - Organohalogen emissions from saline environments and spatial extrapolation using remote sensing. - Abiotic formation of polar organic compounds in soils by Fenton chemistry - Results from model reactions and soil samples. - Chloromethane release from carbonaceous meteorites affords new insight into Mars lander findings (analytical support to subproject Keppler). - Abiotic furan formation with a Fe2+ bispidine complex and the natural occurrence of furans in hypersaline environments (together with subproject Comba). - Thermolytic degradation of methylmethionine and implications for its role in dimethylsulphide and chloromethane formation in hypersaline environments. - Natural occurrence of volatile mono-/polyhalogenated hydrocarbons in water and sediments samples from hypersaline environments. With our investigations of halogenated compounds in Fluid Inclusions and our contribution to organic compounds on carbonaceous meteorites the route is paved for new research to origin of life – be it on Earth or on extraterrestrial bodies. Most remarkable are also the findings of longer-chained monohalogenated alkyl halides in water and soil samples from hypersaline environments that point to new - up to now - undisclosed halogenation processes in chloride saturated acidic aqueous solutions.

Projektbezogene Publikationen (Auswahl)

 
 

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