1 / 11

SIA of trace gases by CF- IRMS

SIA of trace gases by CF- IRMS. Sample Types. CO 2 , N 2 O, N 2 , CH 4 ; other gases by arrangement Atmospheric, soil, breath, and dissolved gases Natural abundance to 99 atom% (>50 atom% by prior authorization only) Dual-tracer method (N 2 & N 2 O). Sample Preparation.

noura
Download Presentation

SIA of trace gases by CF- IRMS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SIA of trace gases by CF-IRMS

  2. Sample Types • CO2, N2O, N2, CH4; other gases by arrangement • Atmospheric, soil, breath, and dissolved gases • Natural abundance to 99 atom% (>50 atom% by prior authorization only) • Dual-tracer method (N2 & N2O)

  3. Sample Preparation • Labco Exetainers, 12mL • Avoid “wide” exetainers (###W/W) • Other vials suitable by prior arrangement • Fill to ~ atmospheric pressure • Butyl or butyl/silicone septa are best • Overtightened septa can leak and clog autosampler needles Overtightening deforms septa

  4. Sample Preparation • If samples require poisoning, use ~1mL 50% w/v ZnCl2; UCD SIF cannot accept samples containing HgCl2 • Please provide estimates of gas concentration and enrichment or provide test samples • For DIC, prepared samples do not require poisoning and should not be frozen

  5. Evacuate and flush-fill sample vials • Do not buy “pre-evacuated” vials from Labco (hint: they are not empty). • If vials will not be filled with sample gas, flush fill your vials with helium to near atmospheric pressure.

  6. Sample Organization and Shipping • If applicable, organize samples by increasing isotopic enrichment • Label vials clearly; avoid adding labels on top of labels • Protect glass from impact and label boxes as fragile

  7. Paperwork • Complete an Analysis Order Form for each analysis type • Complete a sample list for each Analysis Order From • Email forms to sif@ucdavis.edu • Include printed copies with samples

  8. SIA of trace gases by CF-IRMS • Three dedicated trace gas instruments • ThermoScientific and Sercon • Atmospheric concentrations to pure gases

  9. Chromatography

  10. Data Review

  11. Data Reduction and Corrections • Blank • Drift • Size • Scale expansion • Corrections follow those of Kaiser and Röckmann 2008 Kaiser, J. & T. Röckmann 2008. Rapid Commun. Mass Spectrom.

More Related