Stable Isotope Group

research fields

people:

Stable Isotope Group Halle

Dr. Kay Knöller (group leader)

Christina Jeschke (PhD Student)

  • Stable isotope based assessment of natural attenuation processes in lignite mining landscapes

Christin Müller (PhD Student)

  • Isotope patterns to model large scale mass transport and flow dynamics in two European catchments (Poster)

Petra Blümel (technician)

  • Data management and quality assurance, measurement of stable isotopes in water

Martina Neuber (technician)

  • nitrogen and carbon isotope determination in water and sediment samples

Wolfgang Städter (technician)

  • technical management of the stable isotope laboratory

Sandra Zücker-Gerstner

  • sulfur isotope determination in water and sediment samples



Isotope analytical competence:



water cycle

  • sequential equilibration (δ18O/δ2H)
  • online pyrolysis TC/EA for micro volumes (δ18O/δ2H)
  • laser cavity ring down system for micro volumes (δ18O/δ2H)
  • vacuum distillation of highly saline samples (δ18O/δ2H)


nitrogen cycle
ammonium:

  • δ15N routine measurement of micro amounts

nitrate:

  • δ15N/δ18O: high throughput-high precision routine measurement with online combustion/pyrolysis EA and TC/EA (AgNO3 method)
  • δ15N/δ18O: high throughput-micro amount routine measurement with online denitrifier method

nitrite:

  • δ15N/δ18O: high throughput-micro amount routine measurement with online denitrifier method
  • δ15N/δ18O: high precision-micro amount measurement with chemical N2O method
  • nitrite/nitrate separation by ion chromatography (Knöller et al. 2011)



sulfur cycle
dissolved sulfur species:

  • δ34S: online combustion EA of dissolved sulfide, colloidal elemental S, dissolved organic sulfur, thiosulfate
  • δ18O: sulfate: high throughput-high precision routine measurement with online pyrolysis TC/EA

sedimentary sulfur species:

  • δ34S: online combustion EA and micro-amount techniques for total sulfur, elemental sedimentary sulfur, sulfide minerals, total organic sulfur, humic and fulvic acids, sulfate minerals



carbon cycle
dissolved inorganic carbon and solid carbonates:

  • δ13C/δ18O: high throughput-high precision routine online measurement (Gasbench)

solid organic matter:

  • δ13C/δ18O: combined high throughput-high precision routine measurement with online pyrolysis TC/EA (Knöller et al. 2005)
  • δ2H: high throughput-high precision routine measurement with online pyrolysis TC/EA (Knöller et al. 2007)

dissolved organic carbon:

  • δ13C: high precision routine online measurement (Gasbench)