[Diuron degradation process and change of toxicity by gamma-irradiation].
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.
Zhang
Ji-Biao
JB
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. zhangjb33@126.com
Zheng
Zheng
Z
Ye
Lin
L
Shen
Rong-Yan
RY
Zhao
Yong-Fu
YF
Jiang
Li-Juan
LJ
Feng
Jian-Fang
JF
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
D006540:Herbicides; D014874:Water Pollutants, Chemical; D004237:Diuron