GC separates as a similar principle to HPLC where the mobile phase is now gas rather than liquid. There is also the further dimension of volatility to separate samples, rendering it more common for low molecular weight, highly volatile materials. This is often used for checking purity of materials or following monomer consumption for kinetics. Is considered to be quantitative when used appropriately.

GCMS separates as GC with a mass spec as the detector. This allows for chemical identification of analytes. Very rarely can it be quantitative - Is often combined with GCFID for this purpose. Coming soon we will have headspace capabilities.

Shimadzu GC2014 FID

Shimadzu QP2010 GCMS

Scion GCMS with headspace injector

Scion GCFID

Shimadzu HPLC PDA