We are beginning to run 18-O on solid organics by pyrolysis to CO.  The (ceramic) pyrolysis column is packed with glassy carbon grit with ~10% nickelized carbon.  After about 150 samples, the peak shape deteriorates and the signal drops.  The column packing appears (visually) unchanged from the initial packing.  Can the glassy carbon be regenerated/cleaned and reused?

Also, Alfa Aesar has two "types" of glassy carbon that differ primarily in their "maximum service temperature".  We (by mistake) are currently using the lower temperature glassy carbon (1100C).  What does maximum service temperature specify and what kind of change in behavior am I likely to see with the higher temperature (3000C) grit?

Thanks.
- Joy Davis
Old Dominion University
Norfolk, VA, USA