title: Gamma radiolysis of alachlor aqueous solutions in the presence of hydrogen peroxide.
abstract: The enhanced effect of gamma irradiation with hydrogen peroxide (H(2)O(2)) for alachlor degradation in an aqueous solution was first investigated in this study. The combination of gamma irradiation and H(2)O(2) led to an enhanced effect, which remarkably increased the degradation efficiency of alachlor and the total organic carbon (TOC) removal. At a dose of 200 Gy, the degradation degree of the alachlor solution reached 81.7 and 99.2% under H(2)O(2) concentrations of 0 and 0.1 μM, respectively. In addition, the TOC removal efficiencies of the alachlor under initial H(2)O(2) concentrations of 0, 0.5 and 1.0 μM were 59.5, 74.8 and 83.8%, respectively, at an absorbed dose of 20 k Gy. However, for higher H(2)O(2) concentrations (greater than 1 μM), the alachlor degradation was reduced because OH radicals were scavenged by the H(2)O(2). The biodegradability of alachlor solutions prior to and after treatment by gamma irradiation was also assessed using the Closed Bottle Test (CBT). The results showed enhanced biodegradability of alachlor with increasing absorbed doses.
authors.affiliation: Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 580-185, Republic of Korea.
authors.forename: Dongkyu
authors.initials: D
authors.lastname: Choi
authors.affiliation: Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 580-185, Republic of Korea.
authors.forename: O-Mi
authors.initials: OM
authors.lastname: Lee
authors.affiliation: Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 580-185, Republic of Korea.
authors.forename: Seungho
authors.initials: S
authors.lastname: Yu
authors.affiliation: Department of Environmental Engineering, Kunsan National University, Kunsan 573-701, Republic of Korea. Electronic address: swjeong@kunsan.ac.kr.
authors.forename: Seung-Woo
authors.initials: SW
authors.lastname: Jeong
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D001673:Biodegradation, Environmental; D006540:Herbicides / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D012996:Solutions; D014867:Water
chemical_list: D000081:Acetamides; D006540:Herbicides; D012996:Solutions; D014867:Water; C000188:alachlor; D006861:Hydrogen Peroxide