The Effect of High-Pressure Arc Discharge Plasma on the Degradation of Chlorpyrifos

摘要

A study is conducted to determine the effect of a kind of high-pressure arc dischargeplasma on the degradation rate and kinetic equations of chlorpyrifos in different solvents with thetreated times and concentrations as variables.The degradation rate was sorted in different solventsas water,methanol,acetone and then acetoacetate.The tendencies of the degradation rates withtreated time in water and methanol were optimally fitted with first-order kinetics equations whilethose in acetone and acetoacetate were fitted with zeroth-order kinetics equations.The differencewas attributed to the stronger polarity of water and methanol.The weak correlation of thedegradation rates with time was mainly because the high-temperature of the arc discharge tube andthe chemically-active species generated by the discharge.The degradation half-life was extendedwith increase of chlorpyrifos concentration.A degradation half-life less than 3 min was achievedfor chlorpyrifos in water and methanol when the initial concentration was less than 300μg/ml.