leptophos
Definition: Leptophos (O-(4-bromo-2,5-dichlorophenyl) O-methyl phenylphosphonothioate) belongs to the organophosphates and at room temperature it is a stable white solid. It is also known as Phosvel, Abar and Vcs 506. Leptophos was primarily used as a pesticide and fungicide. for rice, cotton, fruit and vegetables until its use was discontinued in 1975 in USA, but still sold in South-Eastern Asia in 1981.Leptophos was first discovered to be toxic in 1974 when more than 1000 water buffaloes died after exposure to leptophos in Egypt. In response to this event, the effect of leptophos was investigated on chickens, mice and sheep.
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