期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 50, 期 15, 页码 8093-8102出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b02109
关键词
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资金
- U.S. National Science Foundation [CBET 1235288, 1453906]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1453906] Funding Source: National Science Foundation
We studied the formation of photochemically produced reactive intermediates (RI) from dissolved organic matter (DOM). Specifically, we focused on the effects of variable molecular weight and chemical reduction on the optical properties of DOM (absorbance and fluorescence) and the formation of singlet oxygen (O-1(2)), DOM triplet excited states ((DOM)-D-3*), and the hydroxyl radical ((OH)-O-center dot). The data are largely evaluated in terms of a charge-transfer (CT) model, but deficiencies in the model to explain the data are pointed out when evident. A total of two sets of samples were studied that were subjected to different treatments; the first set included secondary-treated wastewaters and a wastewater-impacted stream, and the second was a DOM isolate. Treatments included size fractionation and chemical reduction using sodium borohydride. Taken as a whole, the results demonstrate that decreasing molecular weight and borohydride reduction work in opposition regarding quantum efficiencies for O-1(2) and (DOM)-D-3* production but in concert for fluorescence and (OH)-O-center dot production. The optical and photochemical data provide evidence for a limited role of CT interactions occurring in lower molecular -weight DOM molecules. In addition, the data suggest that the observed optical and photochemical properties of DOM are a result of multiple populations of chroinophores and that their relative contribution is changed by molecular-weight fractionation and borohydride reduction.
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