دورية أكاديمية
أعرض في EDS

Molecular Composition and Photochemical Reactivity of Size-Fractionated Dissolved Organic Matter.

التفاصيل البيبلوغرافية
العنوان: Molecular Composition and Photochemical Reactivity of Size-Fractionated Dissolved Organic Matter.
المؤلفون: Maizel AC; Department of Civil and Environmental Engineering, University of Wisconsin - Madison , Madison, Wisconsin 53706, United States., Remucal CK; Department of Civil and Environmental Engineering, University of Wisconsin - Madison , Madison, Wisconsin 53706, United States.; Environmental Chemistry and Technology Program, University of Wisconsin - Madison , Madison, Wisconsin 53706, United States.
المصدر: Environmental science & technology [Environ Sci Technol] 2017 Feb 21; Vol. 51 (4), pp. 2113-2123. Date of Electronic Publication: 2017 Feb 10.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: American Chemical Society Country of Publication: United States NLM ID: 0213155 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5851 (Electronic) Linking ISSN: 0013936X NLM ISO Abbreviation: Environ Sci Technol Subsets: MEDLINE
أسماء مطبوعة: Publication: Washington DC : American Chemical Society
Original Publication: Easton, Pa. : American Chemical Society, c1967-
مواضيع طبية MeSH: Rivers/*chemistry , Singlet Oxygen/*chemistry, Lakes ; Organic Chemicals/chemistry ; Photochemistry ; Water/chemistry
مستخلص: The photochemical production of reactive species, such as triplet dissolved organic matter ( 3 DOM) and singlet oxygen ( 1 O 2 ), contributes to the degradation of aquatic contaminants and is related to an array of DOM structural characteristics, notably molecular weight. In order to relate DOM molecular weight, optical properties, and reactive species production, Suwannee River (SRFA) and Pony Lake fulvic acid (PLFA) isolates are fractionated by sequential ultrafiltration, and the resultant fractions are evaluated in terms of molecular composition and photochemical reactivity. UV-visible measurements of aromaticity increase with molecular weight in both fulvic acids, while PLFA molecular weight fractions are shown to be structurally similar by Fourier-transform ion cyclotron resonance mass spectrometry. In addition, Bray-Curtis dissimilarity analysis of formulas identified in the isolates and their size fractions reveal that SRFA and PLFA have distinct molecular compositions. Quantum yields of 3 DOM, measured by electron and energy transfer probes, and 1 O 2 decreased with molecular weight. Decreasing [ 3 DOM] ss with molecular weight is shown to derive from elevated quenching in high molecular weight fractions, rather than increased 3 DOM formation. This work has implications for the photochemistry of waters undergoing natural or engineered treatment processes that alter DOM molecular weight, such as photooxidation and biological degradation.
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معلومات مُعتمدة: S10 OD018475 United States OD NIH HHS
المشرفين على المادة: 0 (Organic Chemicals)
059QF0KO0R (Water)
17778-80-2 (Singlet Oxygen)
تواريخ الأحداث: Date Created: 20170126 Date Completed: 20170609 Latest Revision: 20181113
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC5889133
DOI: 10.1021/acs.est.6b05140
PMID: 28121132
قاعدة البيانات: MEDLINE
الوصف
تدمد:1520-5851
DOI:10.1021/acs.est.6b05140