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The objectives of this study were to evaluate the application of ozone, hydrogen peroxide and ultraviolet radiation (AOP) process on the degradation ofchlorpyrifos and to determine: the kinetics of chlorpyrifos photodegradation in ultraviolet/hydrogen peroxide(UV/Hsub2/subOsub2/sub) system; the rate constant of carbonate radicals and chlorpyrifos; and, theintegration of carbonate radicals into the UV/Hsub2/subOsub2/sub process of chlorpyrifosdestruction.A collimated-beam UV reactor equipped with four low pressure (LP) mercury lamps(General Electric NO. G15T8) were used in the study. Incident irradiance wasdetermined by a calibrated radiometer (IL1700, SED 240/W, International Light,Peabody, MA). Quantification of chlorpyrifos was carried out on a Varian Pro StarHigh Performance Liquid Chromatography (Varian, Inc., Palo Alto, CA) equippedwith a 330 polychromatic diode array detector and C18 reverse phase column (7.5 x150 mm). Chlorpyrifos concentration was determined with mobile phase of 80%CHsub3/subCN in water with flow rate of 1ml minsup-1/sup and absorbance detection at 275nm.Absorbance spectra were measured using a UV spectrophotometer- Cary Bio100(Varian, Inc., Palo Alto, CA). Includes 9 references, figures.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 5File Size: 1 file , 230 KB