Miss Arashaporn Uthairangsi and Mr. Jakrin Lohanawakul, undergraduate student from TAB-CoE, Division of Physical Science (chemistry), under the Development and Promotion of Science and Technology Talents Project (DPST) funding, took short-term studied during January 27th – June 16th 2023 at Department of Chemical, Biological and Environmental Engineering, Universitat AutÒnoma de Barcelona (UAB), Barcelona, Spain, under supervision of Prof. Paqui Blánquez Cano. Their work studied about chromatograph techniques such as Gas Chromatography (GC-FID, GC-ECD) and Liquid chromatography (LC-MS, HPLC). It is good experience for students get, so that, they can be further applied to their future research work.