کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4416291 1307775 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photo-induced degradation of diuron in aqueous solution by nitrites and nitrates: Kinetics and pathways
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Photo-induced degradation of diuron in aqueous solution by nitrites and nitrates: Kinetics and pathways
چکیده انگلیسی

The photo-induced degradation of diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) in aqueous solution under simulated solar irradiation has been investigated in the presence of NO3-/NO2- ions. The degradation rates were compared by varying environmental parameters including substrate and inducer concentrations, oxygen content and pH. The photoproducts were identified by extensive LC–ESI–MS and LC–ESI–MS–MS studies after SPE preconcentration on prepacked cartridges. In both NO3- and NO2- conditions, oxidation of the N-(CH3)2 terminus group is the main process leading to the N-monodemethylated (NHCH3), N-formyl (N(CH3)CHO) and the uncommon and unstable carbinolamine (N(CH3)CH2OH) by-products. Cl/OH substituted and nitrated phenylureas are formed minorily. Degradation pathways involving OH and NO2 (or dimer) radicals as reactive species are proposed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 66, Issue 4, January 2007, Pages 767–774
نویسندگان
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