The GC/FID sensitivity of the UNITY thermal desorber

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.

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