AWWA WQTC65768

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/H₂O₂) system; the rate constant of carbonate radicals and chlorpyrifos; and, theintegration of carbonate radicals into the UV/H₂O₂ 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%CH₃CN in water with flow rate of 1ml min^-1 and absorbance detection at 275nm.Absorbance spectra were measured using a UV spectrophotometer- Cary Bio100(Varian, Inc., Palo Alto, CA). Includes 9 references, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2007

Number of Pages:

5

File Size:

1 file , 230 KB