Detection of deltamethrin, cypermethrin, and fenvalerate

Deltamethrin is an organic compound with the molecular formula C22H19Br2NO3, and is a white rhombic needle shaped crystal. Almost insoluble in water at room temperature, soluble in various organic solvents. Stable to light and air. It is relatively stable in acidic media and unstable in alkaline media. Deltamethrin is one of the most toxic pyrethroid insecticides to insects, with contact and gastric toxicity. It has a rapid contact and strong knockdown effect, and has no fumigation or inhalation effects. At high concentrations, it has a repellent effect on some pests. Long shelf life (7-12 days). Formulated as emulsifiable concentrate or wettable powder, it is a moderate insecticide. The insecticidal spectrum is wide, and it is effective against various pests such as Lepidoptera, Orthoptera, Thysanoptera, Hemiptera, Diptera, Coleoptera, etc. However, it is very low or basically ineffective in controlling mites, crustaceans, stinkbugs, and other pests. It can also stimulate the reproduction of mites. When mites and insects coexist, it should be mixed with specialized acaricides. Deltamethrin belongs to the toxic class. After reaching a certain net concentration, skin contact can cause irritation symptoms and red papules. During acute poisoning, mild cases may experience headaches, dizziness, nausea, vomiting, loss of appetite, and fatigue, while severe cases may also experience muscle tremors and convulsions. It has a stimulating effect on human skin and eye mucosa, and is highly toxic to fish and bees. Insects that develop resistance to DDT exhibit cross resistance to deltamethrin. On October 27, 2017, the International Agency for Research on Cancer of the World Health Organization released a preliminary list of carcinogens for reference. Deltamethrin is listed as a category 3 carcinogen (existing evidence does not provide a graded evaluation of human carcinogenicity)

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