I used to work in Beijing, China, in the chemical analysis field for over 20 years and now stay in Hobart, Tasmania. I involved in the organic chemical analysis branch, such as GC, GC/MS, GPC, TOC and sample processing related technology and focused on food safety, environmental protection, and emergency tests. Portable GC-MS is a very fast inspective technology for field analysis, suitable for remote zone safety control, chemical incident edge definition, etc.I worked in GC by GC for couples of years, integrated with quadrupole MS or high-resolution TOF-MS(Tofwerk). That is a cut off edge technology for non-target analysis. The 2D dimension GC can expend the ability of conventional GC extremely, therefore a fingerprint can be established. you don't need to know every component in your sample, but you can find the difference among your samples easliy.