Photochemical decomposition rates of pteridines and flavins in seawater exposed to surface solar radiation |
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| Institution: | 1. State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China;2. Advanced Interdisciplinary Institute of Environmental and Ecology, Beijing Normal University, Zhuhai 519000, China;1. State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China;2. School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China;3. Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;4. Institute of Environmental Sciences, Leiden University, Leiden, the Netherlands;5. National Institute of Public Health and the Environment (RIVM), Center for Safety of Substances and Products, Bilthoven, the Netherlands;1. Key Laboratory of Three Gorges Reservoir Region''s Eco-environment, Ministry of Education, Chongqing University, Chongqing, 400045, China;2. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan;3. Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan;4. College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China;5. College of Water Resources and Hydropower Engineering, North China Electric Power University, Beijing 102206, China |
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| Abstract: | Rates of photochemical decomposition of pteridines and flavins, known to occur in reef waters of the Central Great Barrier Reef, Australia, were determined by reverse-phase liquid chromatography with fluorometric detection. The fluorescent transformation products of photodecomposition were identified. First-order photochemical rates were determined for pteridines and flavins exposed to surface solar radiation under aseptic conditions at ambient seawater temperature. Kinetic rates were determined in seawater and compared to photochemical rates determined in distilled water or distilled water with added divalent metal ions (Cu2+, Fe2+ Mn2+ and Mg2+).All pteridines were more stable in seawater than distilled water when exposed to solar radiation. With the exception of folic acid, addition of Cu2+ enhanced the stability of these pteridines, suggesting that natural concentrations of divalent metal ions may be responsible for diminished photochemical decomposition rates in seawater.Riboflavin and riboflavin-5′-phosphate in seawater solution were extremely sensitive to sunlight. The products of riboflavin photochemical decomposition, lumiflavin and lumichrome, proved relatively refractory to solar irradiation. |
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