Gas Chromatograph (GC) (Thermo Fisher Model No. CERES – 800 PLUS) for Quantitative and qualitative analysis of pollutants such as pesticides, Polynuclear aromatic hydrocarbon (PAH’s), Polychlorinated Biphenyls (PCB’s), Dioxins & Furnaces, Benzene, Toluene, Xylene etc. Some of these compounds are very toxic and carcinogenic at very low levels and requires precise instrument such as GC having low detection limits.