TRACE GC ULTRA-ITQ 900 GC/MS is mainly used for the volatile andsemivolatilecomponents analysis in complex samples, including the qualitative and quantitative analysis of trace organic compounds. It can be widely used in water/air/soil quality analysis, pesticide residue analysis, environmental protection, and health fields. Moreover, it could be used to identify the compound structure. Currently, it is mainly used for analysis of polycyclic aromatic hydrocarbons in the environment samples.