The group of soil science deals with the general understanding of biogeochemical cycles in soil. The main focus is on nutrients (e.g. copper, zinc and phosphorus) and pollutants (e.g. antimony, arsenic, cadmium, mercury, uranium). The fate and toxicity of these elements in the environment strongly depends on their speciation (binding partner and redox state). In the case of arsenic, antimony and mercury, the processes of biomethylation and biovolatilization are of particular importance. In addition to these nutrients and pollutants, the sources, transport and toxicity of particulate substances (colloids, micro- and nanoplastics) in soil are also subject of our research.