title: Influence of bovine manure on dissipation of hexazinone in soil.
abstract: The effects of bovine manure (BM) on the degradation of hexazinone and formation of three of its major metabolites were investigated in sandy loam soil. The degradation half-life of hexazinone was 29.6 days in unamended soil, while it decreased to 21.8 days in BM-amended soil. The major metabolites formed in unamended soil were [3-cyclohexyl-6-(methylamino)-1-methyl-1,3,5-triazine-2,4(1, 3H)-dione] (metabolite A) and [3-cyclohexyl-1-methyl-1,3,5-triazine-2,4,6(1, 3, 5H)-trione] (metabolite C), while metabolite B [3-(4-hydroxycyclohexyl)-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1, 3H)-dione] was not detected over the entire experimental period. However, in BM-amended soil, metabolite B was detected at 20 and 40 days after incubation, suggesting that BM contributed to formation of this metabolite. N-demethylation, removal of the dimethylamino group with formation of a carbonyl group at the 6-position of the triazine ring appeared to be the principal mechanisms involved in hexazinone metabolism in unamended soil. However, hydroxylation at the 4-positon of the cyclohexyl group as well as the above two modes were the principal pathways in BM-amended soil.
authors.affiliation: School of Environmental Science and Public Health, Wenzhou Medical College, Luoyu road, Wenzhou, Zhejiang 325035, China.
authors.forename: Huili
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, Central China Normal University, Wuhan 430079, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Grain and Oil, Henan University of Technology, Zhengzhou 450052, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Lu
authors.affiliation: School of Environmental Science and Public Health, Wenzhou Medical College, Luoyu road, Wenzhou, Zhejiang 325035, China.
authors.forename: Changjiang
authors.initials: C
authors.lastname: Huang
authors.affiliation: School of Environmental Science and Public Health, Wenzhou Medical College, Luoyu road, Wenzhou, Zhejiang 325035, China; Department of Land, Air and Water Resources, University of California Davis, Davis, CA 95616, USA.
authors.forename: Minghua
authors.initials: M
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Public Health, Wenzhou Medical College, Luoyu road, Wenzhou, Zhejiang 325035, China. Electronic address: zjuwxd@yahoo.com.cn.
authors.forename: Xuedong
authors.initials: X
authors.lastname: Wang
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000032:analysis* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008372:Manure / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D013997:Time Factors; D014227:Triazines / Q000032:analysis* / Q000378:metabolism
chemical_list: D006540:Herbicides; D008372:Manure; D009930:Organic Chemicals; D014227:Triazines; D002244:Carbon; C025641:hexazinone