Ionization and sensitivity of polycyclic aromatic hydrocarbons using GC-ESI/MS/MS, GC-APCI/HRMS and LC-ESI/MS/MS - Eunju Cha; Eun Sook Jeong; Hophil Min; Changmin Sung; Kwon, Oh-Seung; Sangwon Cha; Lee Jae Ick (2.7 KIST)