The GC/FID sensitivity of the UNITY thermal desorber
Application Note 017
The overall sensitivity of a TD–GC method depends on a number of factors including split ratio, desorption efficiency and general GC performance.
UNITY™ and ULTRA-UNITY™ – Markes’ manual and fully automated two-stage TD systems – incorporate an electrically-cooled, sorbent trap for (re)focusing and releasing organic compounds ranging in volatilility from acetylene to n-C36 and above.
Sorbent traps overcome the water incompatibility issue associated with capillary cryofocusing, but their design needs to be a careful compromise between quantitative retention and efficient desorption.