Degradation of Flumioxazin in Illuminated Water-sediment Systems
Flumioxazin, 2-7-fluoro-3, 4-dihydro-3-oxo-4-(2propynyl)-2H-1, 4-benzoxazine-6-yl-4,5 ,6,7tetrahydro- 1H-isoindole-1,3-(2H)-dione, is a preemergence herbicide controlling a broad spectrum of weeds. In order to understand the behavior of photolabile flumioxazin in the aquatic environment, the aerobic aquatic metabolism study under illumination and in darkness was conducted using two different types of natural water-sediment systems and associate natural waters. 14C-Flumioxazin, separately labeled at 1- and 2-positions of the tetrahydrophthalimide moiety or uniformly at the phenyl ring, was applied to an overlying water at the rate equivalent to 600 g ai/ha by assuming uniform distribution in the water layer to a depth of 100 cm. Each test vessel was incubated at 20° C up to 30 days under illumination (λ>290 nm) , and the overlying water and associated sediment were separately analyzed to clarify the effects of illumination and bottom sediment on the dissipation of flumioxazin and the formation/decline of its degradates.
flumioxazin water-sediment system hydrolysis photodegradation natural water
Atsushi Shibata Rika Kodaka Takuo Fujisawa Toshiyuki Katagi
Environmental Health Science Laboratory, Sumitomo Chemical Co. , Ltd. ,Takarazuka, Japan
国际会议
北京
英文
140-141
2012-09-15（万方平台首次上网日期，不代表论文的发表时间）