Displaying 1 results of Paraquat Impurities Paraquat is a highly toxic herbicide used to control weeds and grasses. However, the manufacturing process for paraquat can result in the presence of impurities. These impurities can include toxic and carcinogenic compounds such as diquat, ethylene dibromide, and acrolein. It is important to monitor and control these impurities to ensure the safety of workers handling paraquat and the environment in which it is used.