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Formation of biogeochemical surfaces and their role in nutrient (e.g. C, N and P) cycling

The aim of the project is the understanding of the formation of biogeochemical surfaces and their role in the accumulation and transformation processes of nutrients (C, N and P). We focus on surfaces of organo-minerals and surfaces formed through colloid aggregation and deposition. We study the formation of these interfaces and characterize them by gas adsorption, porosimetry, microscopy (REM, AFM, fluorescence), scattering (light, X-ray), and zeta potential. Concerning the organo-minerals, we investigate the nature of the organic component as well as the role of minerals. The main emphasis in the formation of interfaces by aggregation and deposition of soil colloids lies on kinetics and stability as well as the role of EPS, soil organic matter (SOM), soil water chemistry and hydro-dynamical forces.

The second focus of this project is the accumulation and transformation processes of nutrients on the above described surfaces. We investigate the effects of mineral type and SOM quality of organo-minerals on the interactions with nutrients and the interactions of nutrients with aggregated colloids and colloid-coated interfaces. The relevant exchange and transfer processes are studied by NMR, FT-ICR-MS, IRm-GC-MS, vibration spectroscopy (FTIR, Raman). The aim is to understand the complex role of biogeochemical interfaces in the cycling of elements.

 
Contact :

PD Dr. Erwin Klumpp
Tel. : ++49 2461 61 6635
E-mail: e.klumpp@fz-juelich.de


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