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

ABSTRACT: The photochemical production of reactive species, such as triplet dissolved organic matter (³DOM) and singlet oxygen (¹O₂), 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

SUBMITTER: Maizel AC 

PROVIDER: S-EPMC5889133 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature