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1. Staff Contact:  Peter Jewett (725-6813)

2. General: The GC is available to all members of the Stanford community.  This is a user run instrument.  Before signing up, users must complete the Radiation Safety Questionnaire, participate in a training session on the instrument and be certified by a facility technician.  The Radiation Safety Questionnaire is based on information available in the Stanford Radiation Protection Manual, as well as in the Ni63 radionuclide safety data sheet and sealed source documentation.  Once certified, users planning to run samples must sign up on the GC Scheduler.  In addition, all users must fill out the user log book each time the machine is operated or modified.  The Shimadzu 14A Instruction Manual and user log book are kept in a three ring binder on the shelf above the instrument. Users must wear safety glasses while operating this instrument. 

3. Operation: The GC is available for use by certified users Monday through Friday, 8am to 5pm.  Once certified, arrangements can be made to use this machine during off hours.

4. Cost:  The GC costs $15 per hour.  Instrument setup, sample analysis and data finalization will all be billed at this rate.  Users must have a valid Stanford PTA to sign up for this instrument.

5. Samples: Four mls of sample is needed per injection.  If you are analyzing N20, CH4 and/or CO2 on the same sample, you will need eight mls of sample as you will be injecting sample into both valve 1 and 2.  Wheaton vials that have been evacuated and filled with sample are less perishable and are the preferred means of collection.  In some cases, sample can collected and stored in a syringe and directly injected into the instrument.

6. Standards:  The lab provides the following standards for users:  Nitrous oxide in nitrogen (0.1, 0.5 and 1.0 and 10ppm), carbon dioxide in nitrogen (499 and 1000ppm), and methane in air (2 and 10ppm) high purity standards in Scotty II (14L) disposable cylinders. Users in need of other standards will need to need to purchase those prior to using the instrument. 

If you have any questions, please email Peter Jewett or call 725-6813.

Data: After analysis is complete, please remove your files from the instrument computer via email.  All data collected on the GC computer will be saved for at least 30 days. Files older than 30 days may be deleted to make space on the hard drive if needed.

You can get more detailed information by checking out our FAQ.