text: * Cost of reactor and replacements (each replacement unit costs ~ $6000) 
  * Addition of dead volume causes an increase in peak broadening depending on the GC column flow rates and molecule types (5-10% broadening is typical)
  ** Heteroatoms and oxidation of Polyarc transfer lines increase this broadening
  * Susceptible to sulfur, silicon, and halogen poisoning
  * Requires constant feed of hydrogen
  * Cannot be regenerated in-house; must be shipped back to the manufacturer for a replacement
  * Cannot be used with cryogenic oven temperatures, or for GCxGC
  * Poor response for species containing C-F bonds
  * May contribute to power overload on older GC models, preventing the use of other heated components such as valve boxes or auxiliary detectors