Isotopic analysis of Nitrogen (N2) gas.
- Headspace gas samples can be sent in over-pressured (at least by 3 mL) Exetainers or serum bottles.
- Please note that we need to know the approximate N2 concentration in the sample. This allows us to estimate injection volume into the GC inlet.
- Samples should be grouped together based upon anticipated N2 This allows us to decide the concentration range of the standards.
- Samples should not be enriched by more than 5 atom percent. Please let us know the expected level of enrichment in the samples. Arrange samples in the increasing order of enrichment.
Samples are analyzed using our HP 5890 Gas Chromatograph (Agilent) with a modified inlet coupled to the Isoprime 100 IRMS (Elementar). Natural abundance isotope data is calibrated by analyzing varied amount of air samples every couple of hours during the course of the day to correct for instrument linearity and/or drift during the day. In-house standards are prepared to calibrate the enriched isotope