Dear colleague, using SPME you have possibility  to enrich some compounds in HS sample. See our article on my page :  

Application of GC-MS with a SPME and thermal desorption technique for determination of dimethylamine and trimethylamine in gaseous samples for medical diagnostic purposes.

Beata Wzorek, Paweł Mochalski, Ireneusz Sliwka, Anton Amann

Regards, ISliwka

There are a variety of reports in the literature concerning this case. Moreover, some comprehensive review papers have been published comprising these methods. For instance, you can have a look on the following paper:

New trends in the analysis of the volatile

fraction of matrices of vegetable origin:

a short overview. A review.

Carlo Bicchi,* Cecilia Cagliero and Patrizia Rubiolo

Thanks for your reply