AGFD 91 |
| The use of organophosphate pesticides by small developing states of the Caribbean has increased tremendously in recent years. The vast majority of these pesticides are used in the agricultural sector. A major degradation pathway for organophosphate pesticides is through hydrolysis. The hydrolysis of the organophosphate pesticides profenofos and isazofos, was studied in the laboratory simulating field conditions existing in the Caribbean. The concentrations of the pesticides were determined using Gas Chromatograph equipped with an Electron Capture Detector, and GC Mass Spectrometer was used to confirm metabolites. Experimental results will be presented showing the rate constants determined, following a first order kinetic model for both profenofos and isazofos. The calculated half- life from the rate constants for pH range 4 – 11 will also be presented along with data on the hydrolytic metabolites of these pesticides. The rate of hydrolysis was found to increase with increasing pH values indicating base catalysed process to be predominant. The recovery of profenofos and isazofos from aqueous media was 90-95 percent and 88 – 97 percent respectively. |
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General Posters
1:00 PM-3:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Poster
Division of Agricultural & Food Chemistry |