EI	electron: impact mode
CAR	carboxen
DBV	divinylbenzene
GC-MS	gas chromatography-mass spectrometry
HCA	hierarchical cluster analysis
HS-SPME	head space solid phase microextraction
IS	internal standard
MVSA	multivariate statistical analysis
NIST	National Institute of Standards and Technology
PDMS	polydimethylsiloxane
PLS-DA	partial least square discriminant analysis
PTFE	polytetrafluoroethylene
RT	retention time
VIP	variable importance in projection
VOMs	volatile organic metabolites