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The degradation and mineralization of acephate by ionization irradiation

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Abstract

The degradation and mineralization of acephate in aqueous solutions by 60Co-γ irradiation were investigated. The acephate was dissolved in different pH buffer solutions and purged for 30 min using anticipate gas. It was found that the degradation ratio of acephate increased gradually with the absorbed dose, and the inorganic ions, inline image, inline image, and inline image, were generated in the irradiated solutions. For the solutions without oxygen, the degradation ratio of acephate in N2-saturated solutions containing t-BuOH was the highest, and that in N2-saturated solutions was higher than that in N2O-saturated solutions. However, the total concentration of inorganic ions in N2O-saturated solutions was higher than that in the other solutions. Moreover, the concentration of inline image in N2-saturated solutions containing t-BuOH was larger than that of inline image and inline image, whereas in inline image or N2O saturated solutions, the concentrations of inorganic ions were in the order of inline image > inline image > inline image. In the air-saturated and O2-saturated solutions, it was found that the concentration of inorganic ions generated was in the order of inline image > inline image > inline image. The degradation degree of acephate and the concentrations of inorganic ions in O2-saturated solutions were higher than those in the air-saturated solutions. The result showed that both of the oxidative and reductive radicals could degrade the acephate, and the oxidative could improve the mineralization of acephate. It was further concluded that it was easier for the reductive radicals to attack the bonds around N than other bonds around S and P, and the S[BOND]C and P[BOND]S bond are easily attacked by oxidative radicals. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 324–332, 2015

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