H or O Solids:
δ18O (δ2H) analysis of solid samples
- SIBS uses a Thermo Scientific High Temperature Conversion/Elemental Analyzer (TCEA) coupled to a Thermo Scientific Delta V Advantage Isotope Ratio Mass Spectrometer.
- Common sample materials for this analysis are feather, hair (for H and O), and cellulose (for O).
- Please contact us for guidance on sample sizes, typically on the order of 0.1-0.5 mg.
- We analyze keratin samples for the δ2H and δ18O separately. For control for exchangeable H atoms, keratin standards from Environment Canada (KHS and CBS) are used. We also include new keratin standards from USGS (USGS42 and 43) in the analysis. For the keratin δ18O analysis, a 1.5m GC is used for better seperation of nitrogen and oxygen peaks.
Sample Submission Procedures
- Fill out the “Sample submission form OH_Solid”, and send it to Dr. Ayumi Hyodo (email@example.com).
- Make sure samples are dried and ground or cut (depending on sample material).
- If you are sending pre-weighed samples:
- Ask us how much you need to weigh (generally Cellulose: 0.23mg, Keratin: 0.5mg).
- Weigh your sample in 3.5x5 mm silver capsule (Part #041066) from Costech.
- Pack the silver capsules – make it as small as possible and make sure samples are not spilling out from the silver. Put it in a seat (e.g., A1, A2…H12) of a sample plastic tray from Costech (Part #080016).
- Record the seat position, the sample ID, and the weight in an Excel file.
- Put a lid on the sample tray, and tape it well to avoid move or jump of samples.
If you are sending samples without weighing:
- Please make sure Sample IDs are clearly shown on labels and samples are ground well.
- Samples should be kept in glass vials with screw caps. In this way, we can easily dry samples in an oven; please avoid plastic centerfuge tubes.
Send the package to Ayumi Hyodo,Rm 125 Kleberg Center, Department of Ecosystem Science & Management 2126 TAMU, TX, 77843-2126.