title: [Diuron degradation process and change of toxicity by gamma-irradiation].
abstract: The radiation-induced degradation process of diuron and change of toxicity by gamma-irradiation were investigated. The contribution to diuron degradation by the radicals is in the order of: *OH > e(aq)(-) > *H. The quantum efficiency ratios of *OH, e(aq)(-) and *H for the degradation of diuron are calculated as 3 : 1 : 2. e(aq)(-) and *H could reduce diuron and its degradation product by loss of the chlorine atoms and the addition reaction. Both the shift and alkaline substitute mutations firstly increase and then decrease with the increase of irradiation time. But, the sample only shows mutagenic potential in Ames assay (TA100 strain) when 22.2 min is selected as the irradiation time. The acute toxicity firstly decreases and then increases with the increase of irradiation time and the more toxic substances are produced.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. zhangjb33@126.com
authors.forename: Ji-Biao
authors.initials: JB
authors.lastname: Zhang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zheng
authors.forename: Lin
authors.initials: L
authors.lastname: Ye
authors.forename: Rong-Yan
authors.initials: RY
authors.lastname: Shen
authors.forename: Yong-Fu
authors.initials: YF
authors.lastname: Zhao
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Jiang
authors.forename: Jian-Fang
authors.initials: JF
authors.lastname: Feng
mesh_terms: D004237:Diuron / Q000737:chemistry* / Q000633:toxicity; D005720:Gamma Rays; D006540:Herbicides / Q000737:chemistry / Q000633:toxicity; D009152:Mutagenicity Tests; D010776:Photobacterium / Q000187:drug effects / Q000254:growth & development; D010782:Photolysis / Q000528:radiation effects; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D023382:Toxicity Tests, Acute; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical; D004237:Diuron