The Benzene is one kind of hydrocarbon, in other way, it is the simplest aromatics. Benzene is a sweet, flammable, carcinogenic, colorless transparent liquid at room temperature, having strong fragrant smell. Methylbenzene and xylene belong to the homologues of benzene and are the cracking products of coal tar fractionation or petroleum. Because of the harmfulness of benzene, benzene compounds have been identified as strong carcinogens by the World Health Organization. As one of the largest chromatography consumables manufacturer in south of China, Aijiren talk about GS analysis in benzene element in air.