Document Type : Research Paper
Authors
University of Anbar - College of Science
Abstract
During this research the degradation has been studied for the pesticide Chlorpyrifos (phosphorus pesticide) by ultrasonic technique (sonolysis) through the use of different amplitudes (100,50,25%) from amplitude generator ultrasound, for the periods of time (30,20,10,5) minute with the concentrations (40,30,20) ppm for pesticide Chlorpyrifos. It has been dealt with the degradation by measuring the changes in the electrical conductivity (EC) and (pH). The results showed that sonolysis of Chlorpyrifos increases with each the time and the amplitude of the ultrasound. The value of the electrical conductivity (EC) up to the highest value at the period of time 30 minutes and all amplitude, but it reaches its highest value at amplitude 100% with all the concentrations used, because of the liberation of different ions in the reaction mixture. The pH value decreases to the lowest value at the same condition, because the number of hydrogen atoms increases. The kinetic studies explained that the rate of decomposition by the ultrasound for pesticide Chlorpyrifos from the first order and all concentrations and amplitudes used and so draw the relationship between the (Ln (Ec/Ec0) and duration of exposure ultrasonic.
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