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|Section2= |Section3= }} 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.〔(【引用サイトリンク】url=http://www.inchem.org/documents/jmpr/jmpmono/v075pr25.htm )〕 for rice, cotton, fruit and vegetables until its use was discontinued in 1975.〔(【引用サイトリンク】title=Toxipedia: Leptophos )〕 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. ==History== In Egypt, leptophos used on cotton in 1971 caused the death of more than 1000 water buffalos and a number of farmers. The compound was never registered for domestic use by the Environmental Protection Agency (EPA) but was exported from the U.S. to at least 30 countries. Leptophos was discontinued for use in late 1975 due to its high toxicity. Between 1971 and 1976 the U.S. used $4 million in United States Agency for International Development funds to ship 13.9 million pounds of leptophos and other banned pesticides to 50 countries. In 1975 U.S. companies alone, exported over 3 million pounds of leptophos. When Colombia banned leptophos in 1977, the American company Velsicol stopped the production and shipped it's Colombian stocks to El Salvador. No prohibitions exist in El Salvador. In other instances Leptophos was imported to Costa Rica via Mexico and Panama, and until 1981 Leptophos was being sold in Indonesia.〔(【引用サイトリンク】url=http://www.culturalsurvival.org/publications/cultural-survival-quarterly/cameroon/some-pesticides-use-around-world )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Leptophos」の詳細全文を読む スポンサード リンク
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