Organophosphorus pesticides demeton

The second group, persistent pesticides, includes certain triazine herbicide derivatives, 2,4-dichlorophenoxycarbonic acids, and others (Buslovich 1986, Popovich and Burkatskaya 1986). Moderately persistent pesticides, the third class, include some systemic organophosphorus pesticides (such as demeton, demeton-methyl, Ekatin, and dimethoate), many synthetic pyrethroids, carbamates, and others. Examples of the fourth division, slightly persistent pesticides, are certain contact organophosphorus chemicals like parathion, methyl-para-thion, and others (Kagan 1977, 1981). 

The organophosphorus pesticides oxydemeton-methyl, trichlorfon, dimethoate, dichlorvos, demeton-j-methyl, fenitrooxon, and fenamiphos (and two metabolites)... 

Gas chromatography has been used [183] to determine the following at organophosphorus insecticides at the microgram per litre level in water and waste water samples Azinphos-methyl, Demeton-O, Demeton-S, Diazinon, Disulfoton, Malathion, Parathion-methyl and Parathion-ethyl. This method is claimed to offer several analytical alternatives, dependent on the analyst s assessment of the nature and extent of interferences and the complexity of the pesticide mixtures found. Specifically, the procedure uses a mixture of 15% v/v methylene chloride in hexane to extract... 

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