Navi-Edit

Biogeochemistry
Not availableNot availableNot availableNot availableNot availableNot availableNot availableNaviEdit (4)
MICRONUC
No permissionsNot availableNot availableNo permissionsNo permissionsNot availableNo permissionsNaviEdit (0)
Publications
No permissionsNo permissionsNo permissionsNo permissionsNo permissionsNo permissionsNo permissionsNaviEdit (0)
Projects
No permissionsNo permissionsNo permissionsNo permissionsNo permissionsNo permissionsNo permissionsNaviEdit (0)
Team
No permissionsNo permissionsNo permissionsNot availableNot availableNo permissionsNo permissionsNaviEdit (0)

Contact

Dr. Johannes Raff

Head Biogeochemistry
j.raffAthzdr.de
Phone: +49 351 260 2951

Social Media

  Twitter-Logo

Department of Biogeochemistry

Research in the Biogeochemistry department focuses on understanding the interaction of long-lived radionuclides with biosystems. We are interested in the various levels from biomolecules to individual organisms and complex biocoenoses. On the one hand, the aim is to understand the influence of biological systems on the behavior of radionuclides in the environment (release, mobility and bioavailability). On the other hand, we investigate the effects of radionuclides on the metabolism of cells and the whole organism (uptake, accumulation, chemo- and radiotoxicity) and the resulting dangers for us humans.

Using state-of-the-art molecular biological, spectroscopic and microscopic methods, we work in the fields of repository research to improve the long-term safety of a repository for high-level radioactive waste and radioecology to protect humans and the environment from the dangers of naturally and artificially released radionuclides.

In addition to basic research, our aim is to use the knowledge gained to develop innovative remediation methods and improve models to describe the behavior of radionuclides in the environment.

Interested in working with us?

To support our work, we are always looking for students and interns from the fields of biology, chemistry and environmental sciences who either want to write their thesis with us or simply gain practical experience. Are you interested? Then please get in touch to clarify any questions you may have.

Current research topics

Working fields of the departement of biogeochemistry at the Institute of Resource Ecology (EN) ©Copyright: Dr. Matschiavelli, Nicole
  • Determination of the microbial diversity in water and soil environments contaminated with heavy metals and radionuclides as well as in different host rocks for potential radioactive waste disposals
  • Microbe-radionuclide-interactions with reference strains and isolates
  • Interaction of eukaryotic cells with radionuclides and lanthanides in particular with plants, fungi, sponges and algae
  • Investigation of the interaction of selected bioligands and model compounds with f-elements
  • Characterization of microbial processes affecting the conditions in deep geological repositories for radioactive waste (e.g. transformation of bentonite as barrier material)
  • Calculation and determination of the metal speciation relevant to the environment
  • Verification and validation of transport models
  • Characterization of particles in the environment relevant to the transport of radionuclides
  • Investigation of the transport processes of radionuclides by particles (including microbes) in natural water

Latest Publication

In search of phytoremediation candidates: Eu(III) bioassociation and root exudation in hydroponically grown plants

Klotzsche, M.; Dück, V.; Drobot, B.; Vogel, M.; Raff, J.; Stumpf, T.; Steudtner, R.

Abstract

Lanthanides and actinides are emerging contaminants, but little is known about their uptake and distribution by plants and their interactions in the rhizosphere. To better understand the fate of these metals in plants, we assessed the bioassociation of 2, 20 and 200 µM Eu(III) by five hydroponically grown crops endemic to Europe. The metal’s concentration and its speciation was monitored by inductively coupled plasma mass spectrometry and laser spectroscopy, whereas root exudation was investigated by chromatographic methods. It has been shown, that Eu(III) bioassociation is a two-stage process, involving rapid biosorption followed by accumulation in root tissue and distribution to the stem and leaves. Within 96 h of exposure time, the plant induces a change of Eu(III) speciation in the liquid medium, from a predominant Eu(III) aquo species, as calculated by thermodynamic modelling, to a species with longer luminescence lifetime. Root exudates such as citric, malic, and fumaric acid were identified in the cultivation medium and affect Eu(III) speciation in solution, as was shown by a change in the thermodynamic model. These results contribute to a comprehensive understanding of the fate of lanthanides in the biosphere and provide a basis for further investigations with the chemical analogues Cm(III) and Am(III).

Keywords: europium; speciation; phytoremediation; bioassociation; laser spectroscopy; lanthanides; hydroponics; plant uptake; root exudates; thermodynamic modelling

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39219

Projects

An overview of completed projects can be found here.

Team

Foto: Gruppenbild der Abteilung Biogeochemie des Instituts für Ressourcenökologie ©Copyright: Dr. Johannes Raff

Head

NameBld./Office+49 351 260Email
Dr. Johannes Raff801/P3142951
j.raffAthzdr.de

Employees

NameBld./Office+49 351 260Email
Rahel Bertheau801/P3543138
Dr. Björn Drobot801/P3172895
b.drobotAthzdr.de
Katrin Flemming801/P3092958
k.flemmingAthzdr.de
Dr. Alix Günther801/P2562433
2522
a.guentherAthzdr.de
Max Klotzsche801/P3063241
m.klotzscheAthzdr.de
Dr. Evelyn Krawczyk-Bärsch801/P2522076
e.krawczyk-baerschAthzdr.de
Raul Eduardo Linares Jimenez801/P1032457
r.linares-jimenezAthzdr.de
Julia Marie Mätzkow801/P3062860
j.maetzkowAthzdr.de
Dr. Henry Moll801/P2562433
2549
h.mollAthzdr.de
Antonio Newman Portela801/P1032720
a.newman-portelaAthzdr.de
Dr. Susanne Sachs801/P2082436
s.sachsAthzdr.de
Jana Seibt801/P2193194
2510
j.seibtAthzdr.de
Dr. Robin Steudtner801/P3172895
r.steudtnerAthzdr.de
Lukas Waurick801/P3063241
l.waurickAthzdr.de
Toni Webert.weberAthzdr.de

MICRONUC

NameBld./Office+49 351 260Email
Dr. Andrea Cherkouk801/P3562989
a.cherkoukAthzdr.de
Sindy Kluge801/P2193194
s.klugeAthzdr.de
Dr. Nicole Matschiavelli801/P3182759
n.matschiavelliAthzdr.de
Dr. Ting-Shyang Wei801/P3182759
t.weiAthzdr.de