Composition of volatile organic components on ballpoint pen inks by HS-SPME GC/MS

In forensic examinations of question document, analysis about inks components and the dating of ink entries is often of considerable importance and forensic examination of inks is principally concerned with the classification and comparison of chemically complex mixtures. The authenticity about inks analysis of a questioned document may be examined through the analysis of inks used to TLC, HPLC/MS, GC/MS, LDI/ MS. We collected 56 difference types of black ballpoint pen inks manufactured from 5 country groups. We identified major 6 species volatile organic components (VOCs), ethylbenzene (0.089-0.244 mu g/mL), o-xylene (0.072-0.331 mu g/mL), m, p-xylene (0.062-0.318 mu g/mL), benzene (0.003-0.173 mu g/mL), 1,1-dichloroethylene (0.003-0.295 mu g/mL), toluene (0.007-0.484 mu g/mL) using HS-SPME GC/MS. The results of this study indicated that determined VOCs of black ballpoint pen inks could make a discriminating tool of inks analysis for forensic question document and can supply methodology for classification and identification of between ballpoints pen inks.