Quinoline, also known as benzene and pyridine, n-heterocyclic naphthalene, is an aromatic organic compound of heterocyclic rings. Quinoline is a colorless hygroscopic liquid with a strong odor, and the formula is c9h7n. By exposing quinoline to light, it slowly turns pale yellow and becomes brown further. Quinoline is slightly soluble in water but easily soluble in many organic solvents. Quinoline is an important intermediate in metallurgy, dyestuff, polymer and agro-chemical industry. It can also be used as disinfectants, preservatives and solvents. Quinoline is toxic, and exposure to quinoline steam in a short time can lead to erosion of the nose, eyes and respiratory tract, and may also lead to dizziness and nausea. The influence of long time exposure is uncertain, but Quinoline has a certain relationship with liver injury.