Chromatograph coupled with MS has been proven a powerful

Chromatograph coupled with MS has been proven a powerful tool for identifying unknown species, and developed for separating and characterizing components in coals and coal derivatives [7]. GC/MS is suitable for analyzing relatively volatile, thermally stable, and low polar molecules [8] and [9]. For the separation and analysis of organic species with higher molecular mass over 500 u, and/or lower thermal stability, HPLC/MS is a better choice [10].