How long does paraquat fail in the air?

Paraquat is a rapid herbicide that can be quickly absorbed by plants and withered, so how long does paraquat fail in the air?

What is paraquat

The chemical name of paraquat is 1-1-dimethyl-4-bipyridine cationic salt, which is a rapid extinction herbicide with contact killing effect and certain internal absorption effect.

Paraquat is soluble in water, the appearance is white powder, the main ingredient is 1 'dimethyl 4pyrrolidine, paraquat is extremely toxic to people, and the poisoning mortality rate is more than 99%, so its use has been banned or strictly restricted by more than 20 countries. As of July 1, 2014, China will cancel the registration and production license of Baicao water agent and stop production; however, it will retain the export registration of water agent of mother medicine production enterprises abroad, allow it to be used exclusively for export production, and stop the sale and use of water agent in China on July 1, 2016.

The scope of application of paraquat is: a variety of annual weeds; it has a strong killing effect on perennial weeds, but its underground stems and roots can sprout new branches; it has no effect on lignified brown stems and tree trunks.

Second, how long does paraquat fail in the air?

Paraquat generally does not fail in the air, but it will be passivated by the combination of soil and soil. Paraquat, which is highly toxic to humans and has no specific antidote, was banned by the state in 2016.

Paraquat is an extinct herbicide. If it is not sprayed on the green stems and leaves of crops, the liquid will only be stained with brown woody bark and branches, which will do no harm to crops and trees. Paraquat will lose its activity when it comes into contact with soil, and it will be removed 1-2 days before sowing, which is safe for crops.

III. Toxicology of paraquat

Paraquat can stimulate and corrode the skin and mucous membrane, and systemic poisoning can cause multi-system damage, especially severe lung damage, and can cause lung congestion, hemorrhage, edema, hyaline membrane formation and degeneration, hyperplasia, fibrosis and other changes. in addition, it can also cause liver and kidney damage and involve circulation, nerve, blood, gastrointestinal tract and bladder and other systems and organs.

At present, the mechanism of toxicity has not been elucidated. Most scholars believe that paraquat is an electron acceptor, which can be actively transported by lung Ⅰ and Ⅱ cells and absorbed into the cells. it acts on the redox reaction of the cells. the activation of oxygen free radicals in the cells is the basis of the toxicity. Excessive superoxide anion free radicals (O =) and hydrogen peroxide (H 2O 2) can cause lipid peroxidation of cell membrane in lung, liver and many other tissues and organs, thus causing damage to multiple systems.