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- W1995118546 abstract "Pulse radiolysis experiments were conducted on dissolved organic matter (DOM) samples isolated as hydrophobic and hydrophilic acids and neutrals from different sources (i.e., stream, lake, wastewater treatment plant). Absolute bimolecular reaction rate constants for the reaction of hydroxyl radicals (•OH) with DOM (k•OH, DOM) were determined. k•OH, DOM values are expressed as moles of carbon. Based on direct measurement of transient DOM radicals (DOM•) and competition kinetic techniques, both using pulse radiolysis, the k•OH, DOM value for a standard fulvic acid from the Suwannee River purchased from the International Humic Substances Society was (1.60 ± 0.24) × 108 M-1 s-1. Both pulse radiolysis methods yielded comparable k•OH, DOM values. The k•OH, DOM values for the seven DOM isolates from different sources ranged from 1.39 × 108 M-1 s-1 to 4.53 × 108 M-1 s-1, and averaged 2.23 × 108 M-1 s-1 (equivalent to 1.9 × 104 (mgC/L)-1 s-1). These values represent the first direct measurements of k•OH, DOM, and they compare well with literature values obtained via competition kinetic techniques during ozone or ultraviolet irradiation experiments. More polar, lower-molecular-weight DOM isolates from wastewater have higher k•OH, DOM values. In addition, the formation (microsecond time scale) and decay (millisecond time scale) of DOM• transients were observed for the first time. DOM• from hydrophobic acids exhibited broader absorbance spectra than transphilic acids, while wastewater DOM isolates had narrower DOM• spectra more skewed toward shorter wavelengths than did DOM• spectra for hydrophobic acids." @default.
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- W1995118546 date "2007-05-22" @default.
- W1995118546 modified "2023-10-03" @default.
- W1995118546 title "Electron Pulse Radiolysis Determination of Hydroxyl Radical Rate Constants with Suwannee River Fulvic Acid and Other Dissolved Organic Matter Isolates" @default.
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- W1995118546 doi "https://doi.org/10.1021/es062529n" @default.
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