Hydrophobic organic compound partitioning from bulk water to the water/air interface |
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| Institution: | 1. Department of Marine Environment and Engineering, National Sun Yat-sen University, 80424, Kaohsiung, Taiwan, ROC;2. Department of Public Health, College of Health Sciences, Kaohsiung Medical University, 80708, Kaohsiung, Taiwan, ROC;3. Aerosol Science Research Center, National Sun Yat-sen University, 80424, Kaohsiung, Taiwan, ROC;4. Department of Applied Chemistry, Providence University, 43301, Taichung, Taiwan, ROC;5. School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China;1. College of Chemical Engineering, HuaQiao University, China;2. Department of Environmental Engineering, National I-Lan University, Taiwan |
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| Abstract: | Partitioning of hydrophobic organic compounds to the interface between water and air may significantly affect the distribution and transfer of many xenobiotic chemicals between vapor and aqueous phases. The fluorescent probe, 1-methylperylene, was used to investigate the affinity of hydrophobic compounds for the water–air interface by varying the ratio of interfacial surface area to water volume in a fused-quartz cuvette. We found that the water–air/water interface partitioning coefficient Kw−awi=1.2 mol cm-2awi/(mol ml-1w)] for this polycyclic aromatic hydrocarbon (PAH) was quantitatively consistent with partitioning to the same interface but from the airside, recently reported in the literature for less hydrophobic PAHs. Our results demonstrate significant partitioning from bulk water to the water/air interface for a hydrophobicity range relevant to many xenobiotic compounds. Anticipated implications of this process for the environmental chemistry of hydrophobic compounds include retarded gas-phase transport in unsaturated soils, bubble-mediated transport in water, droplet-mediated transport in the atmosphere, and photochemical reactions. |
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