- DELTA V Advantage mass spectrometer with GasBench II for the preparation of carbon samples and integrated autosampler A200S
- DELTA V Advantage mass spectrometer with Finnigan ConFlo IV permanent flow interface connected to Thermo Flash EA 1112 element analyser
- DELTA Plus mass spectrometer with GasBench II for the preparation of carbon samples and integrated autosampler A200S
- A cavity ring-down spectrometer PICARRO Model L1102-with a PAL autosampler for isotope analysis of dD and d18O in water samples
Types of samples to be analysed
Organic material can be reliably analysed from sample sizes of at least 10 micrograms of nitrogen and 50 micrograms of carbon. C and N concentrations should therefore be tested in sample material. Samples should be in powder form and sufficient quantities. The same applies to sediments or rock samples. For instance, if the organic carbon content in sediment samples is to be determined the samples must first be decalcified with 2 N HCl. Chloride compounds that formed during the reaction with hydrochloric acid must be washed out with distilled water. Sample material that has been treated with tracer N or C must be marked as such, and the proportion of tracer should not exceed 10 atom%. Otherwise, the quality of the analyses cannot be guaranteed.
Carbonate samples should also be in powder form. 50 to 400 micrograms of CaCO3 are needed for a reliable analysis. If a sample has been diluted by other components, this must be flagged up to avoid unnecessary repetitions of the analysis.
Liquid samples can be tested for their oxygen and hydrogen isotope ratios in H2O and their carbon isotope ration in diluted inorganic carbon (DIC). Please contact the isotope laboratory in advance to arrange for taking and fixating such samples.
Contact: PD Dr. Ulrich Struck, Marianne Falk