Organophosphorus pesticides, for controlling plant diseases, insects, the pesticide-containing organic compound victims. This kind of pesticide has many varieties, high efficacy, wide application, easy decomposition, and generally does not accumulate in humans and animals, and is a very important class of compounds in pesticides. However, many varieties have strong acute toxicity to humans and animals. In particular, special attention should be paid to safety. In recent years, high-efficiency and low-toxic varieties have developed rapidly, gradually replacing some highly toxic varieties, making the use of organophosphorus pesticides more Safe and effective. So what are the organophosphorus pesticides?
Organophosphorus pesticides are currently the most widely produced and used pesticides in China, accounting for a large proportion of occupational hazards caused by pesticides. Most of the organophosphorus pesticides produced in China are pesticides , such as parathion, endogenous phosphorus, malathion, dimethoate, trichlorfon, dichlorvos, etc.; some varieties such as rice bran, gram, etc. Can be used as a fungicide. In recent years, some rodenticides, nematicides, herbicides, defoliants, infertility agents, growth regulators, etc. have been synthesized.
The most common organophosphorus pesticides are: trichlorfon, dichlorvos, omethoate, malathion, phoxim, chlorpyrifos
According to the toxicity classification of organophosphorus pesticides, they are often divided into three categories:
1, highly toxic: phorate, endogenous phosphorus, parathion, cotton-protected, omethoate;
2, high toxicity: methyl parathion, dimethyl sulfide, dichlorvos, imine phosphorus;
3, low-toxic categories: trichlorfon, dimethoate, chlorpyrifos, ethyl rice Fengsan and so on.
Most organophosphorus pesticides are easily decomposed in alkaline solution and lose their virulence; only trichlorfon is easily soluble in water, and becomes more virulent dichlorvos after contact with alkaline solution. Endogenous phosphorus (1059), parathion (1605), phorate (3911), malathion (4049), dimethoate, etc., after oxidation, the virulence increased. Dibromophosphorus quickly loses bromine in the presence of reducing substances such as metals and sulfur-containing hydrides, forming a more virulent dichlorvos.
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