Photoproduction of hydrogen peroxide in aqueous solution from model compounds for chromophoric dissolved organic matter (CDOM) |
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| Institution: | 1. Institute of Geotechnical Engineering, Southeast University, Si Pai Lou #2, Nanjing 210096, PR China;2. Institute of Lowland Technology, Saga University, Honjo 1, Saga-Shi 840-8502, Japan;3. School of Naval Architecture, Ocean, and Civil Engineering, Shanghai Jiaotong University, 1954 Hua Shan Road, Shanghai 200030, PR China;1. Dipartimento di Chimica “G. Ciamician”, Università di Bologna, and Interuniversity Center for the Chemical Conversion of Solar Energy, Bologna Unit, Via Selmi 2, 40126 Bologna, Italy;2. Dipartimento di Chimica, Università di Parma, Parco Area delle Scienze 17/a, 43124 Parma, Italy;1. Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA;2. Department of Chemistry, University of Hawai’i, Honolulu, HI 96822, USA;3. Bruker AXS Inc., Madison, WI 53711, USA;4. Supramolecular Design Institute, 127 Chestnut Hill Road, Oak Ridge, TN 37830, USA;5. Nuclear Security and Isotope Technology Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA;3. Department of Biochemistry and Biophysics, Stockholm University SE-10691 Stockholm, Sweden and;4. Laboratoire de Chimie et Biologie des Métaux (UMR 5249), CEA-Grenoble, 17, rue des Martyrs, F-38057 Grenoble, France;1. Department of Marine Sciences, University of Connecticut, Groton, CT 06340, USA;2. Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA;1. Department of Radiology and Biomedical Imaging, University of California San Francisco, 505 Parnassus Ave., Box 0628, M-372, San Francisco, CA 94143-0628, USA;2. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091 Zurich, Switzerland;3. Department of Radiology, China Medical University Hospital, No. 2, Yuh-Der Rd., Taichung 40447, Taiwan, Republic of China;4. Department of Biomedical Imaging and Radiological science, China Medical University, No. 91, Syueshih Rd., Taichung 40402, Taiwan, Republic of China |
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| Abstract: | To explore whether quinone moieties are important in chromophoric dissolved organic matter (CDOM) photochemistry in natural waters, hydrogen peroxide (H2O2) production and associated optical property changes were measured in aqueous solutions irradiated with a Xenon lamp for CDOM model compounds (dihydroquinone, benzoquinone, anthraquinone, napthoquinone, ubiquinone, humic acid HA, fulvic acid FA). All compounds produced H2O2 with concentrations ranging from 15 to 500 μM. Production rates were higher for HA vs. FA (1.32 vs. 0.176 mM h?1); values ranged from 6.99 to 0.137 mM h?1 for quinones. Apparent quantum yields (Θapp; measure of photochemical production efficiency) were higher for HA vs. FA (0.113 vs. 0.016) and ranged from 0.0018 to 0.083 for quinones. Dihydroquinone, the reduced form of benzoquinone, had a higher production rate and efficiency than its oxidized form. Post-irradiation, quinone compounds had absorption spectra similar to HA and FA and 3D-excitation–emission matrix fluorescence spectra (EEMs) with fluorescent peaks in regions associated with CDOM. |
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| Keywords: | Hydrogen peroxide Humic Fulvic CDOM Quinone |
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