Multi-method study of the characteristic chemical nature of aquatic humic substances isolated from the Han River,Korea |
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| Affiliation: | 1. Water Environment and Remediation Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Republic of Korea;2. Department of Environmental Engineering, The University of Seoul, 90 Junnondong, Dongdaemungu, Seoul 130-743, Republic of Korea;1. Italian National Institute for Environmental Protection and Research, Laboratory of Chemometrics and Environmental Applications, Via di Castel Romano 100, 00128 Rome, Italy;2. INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina;3. Italian National Institute for Environmental Protection and Research, Via Vitaliano Brancati 60, 00166 Rome, Italy;4. Department of Management, Sapienza University of Rome, Via del Castro Laurenziano 9, 00161 Rome, Italy;1. Institute of Environmental Health, National Taiwan University, Taiwan;2. Department of Civil and Environmental Engineering, University of Delaware, USA;1. Department of Chemical and Biochemical Engineering, Western University, London, Ontario, N6A 5B9, Canada;2. School of Environment, Tsinghua University, Beijing, 100084, China;3. Research Institute for Environmental Innovation (Suzhou), Tsinghua University, Jiangsu, 215163, China;4. Trojan Technologies, London, Ontario, N5V 4T7, Canada |
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| Abstract: | Natural organic matter (NOM) from the Han River, Korea was fractionated into humic and non-humic fractions by absorbing onto XAD-7HP, and these fractions were analyzed using UV-absorption, and for dissolved organic C (DOC). The humic fraction (i.e. humic substances; HS) was extracted and its characteristics were compared to commercial humic materials using various spectroscopic methods such as Fourier transform infrared (FT-IR), proton nuclear magnetic resonance (1H-NMR) and fluorescence spectroscopy. The humic fraction as organic C was 47.0% on the average, however, a rainfall event brought a higher humic fraction into Han River water. The molar ratios of H/C and O/C in the HS from Han River water (HRHS) were 1.40 and 0.76, respectively, and the ratio of aliphatic to aromatic protons in the HS (PAl/PAr ratio) was 5.8. Aromaticity and humification degree (i.e., degree of condensation) of HRHS were relatively lower than those from other humic materials, while the portion of oxygenated functional groups was relatively higher. FT-IR, 1H-NMR and fluorescence spectroscopy showed distinct differences between HRHS and the commercial humic materials. Commercial humic materials are not representative of HS extracted from Han River water. The fluorescence spectra, relatively simple measurements, were found to be most useful as fingerprints for humic materials from particular sources. |
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