DOI: 10.1016/j.watres.2017.11.056
Scopus记录号: 2-s2.0-85040010830
论文题名: Photochemical acetochlor degradation induced by hydroxyl radical in Fe-amended wetland waters: Impact of pH and dissolved organic matter
作者: Yuan C. ; Chin Y.-P. ; Weavers L.K.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 132 起始页码: 52
结束页码: 60
语种: 英语
英文关键词: Acid mine drainage
; Agricultural runoff
; Iron
; Photolysis
; Transformation kinetics
Scopus关键词: Agricultural runoff
; Biogeochemistry
; Degradation
; Drainage
; Impurities
; Iron
; Organic compounds
; pH
; Photolysis
; Reaction intermediates
; Reaction rates
; Wetlands
; Acid mine drainage
; Aquatic contaminants
; Dissolved organic matters
; Hydroxyl radicals
; Orders of magnitude
; Reaction mechanism
; Reactive intermediate
; Transformation kinetics
; Biological materials
; acetochlor
; dissolved organic matter
; fulvic acid
; hydroxyl radical
; iron
; terephthalic acid
; acetochlor
; benzopyran derivative
; hydroxyl radical
; iron
; phthalic acid derivative
; toluidine derivative
; acetochlor
; acid mine drainage
; agricultural runoff
; dissolved organic matter
; fulvic acid
; hydroxyl radical
; iron
; photochemistry
; photodegradation
; reaction kinetics
; transformation
; wetland
; acid mine drainage
; Article
; Fenton reaction
; pH
; photochemistry
; photodegradation
; photolysis
; predictive value
; priority journal
; quantitative analysis
; quantum yield
; reaction analysis
; runoff
; water treatment
; wetland
; chemistry
; industrial waste
; mining
; pH
; radiation response
; sunlight
; water pollutant
; wetland
; Benzopyrans
; Hydrogen-Ion Concentration
; Hydroxyl Radical
; Industrial Waste
; Iron
; Mining
; Photolysis
; Phthalic Acids
; Sunlight
; Toluidines
; Water Pollutants, Chemical
; Wetlands
英文摘要: Iron (Fe) plays a critical role in the formation of hydroxyl radical ([rad]OH) which may participate in the indirect photodegradation of aquatic contaminants. While Fe photochemistry has been extensively studied, the efficacy of iron amendments for contaminant attenuation in sunlit natural waters has not been well researched. We studied the efficacy of this approach by monitoring [rad]OH induced acetochlor (AC) degradation and determining [rad]OH production rates with terephthalate (TPA) as a probe. Surface wetland waters as well as model fulvic acid (FA) solutions were amended with Fe(III) salt at different concentrations at pH values of 2.7, 5, and 7.6. We observed no significant enhancement in the AC degradation rate at circumneutral pH. At pH 5, AC degradation increased by more than 50% with an Fe addition up to an [Fe]T ≈ 6 μM and plateaued at high [Fe]T. At the highly acidic pH of acid mine drainage (AMD) waters, AC degradation was enhanced by two-orders-of magnitude with increasing [Fe]T and no plateau was observed under the conditions tested ([Fe]T ≤ 500 μM). While the Fe induced relative difference in [rad]OH production rates determined using TPA was useful in elucidating the reaction mechanism for different dissolved organic matter types at different pH values, the absolute value of [rad]OH production rates over-predicted the transformation of AC suggesting the existence of unknown side reactions and/or alternative reactive intermediates. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112990
Appears in Collections: 气候减缓与适应
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作者单位: Environmental Science Graduate Program, The Ohio State University, Columbus, OH 43210, United States; School of Earth Sciences, The Ohio State University, Columbus, OH 43210, United States; Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, United States; Oak Ridge Institute for Science and Education (ORISE), hosted at National Exposure Research Laboratory, U.S. Environmental Protection Agency, Athens, GA 30605, United States; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, United States
Recommended Citation:
Yuan C.,Chin Y.-P.,Weavers L.K.. Photochemical acetochlor degradation induced by hydroxyl radical in Fe-amended wetland waters: Impact of pH and dissolved organic matter[J]. Water Research,2018-01-01,132