Characterization of natural organic matter from eight Norwegian surface waters: Proton and copper binding |
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| Institution: | 1. Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education & Guangxi Key Laboratory of Information Materials & School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, PR China;2. Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150001, PR China;3. Guangxi Academy of Sciences, Nanning, 530000, PR China;1. Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland;2. Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, PL-30387 Krakow, Poland;3. Department of Molecular Medical Microbiology, Faculty of Medicine, Jagiellonian University Medical College, Czysta 18, PL-31121 Krakow, Poland;1. Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain;2. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca'' Foscari Venezia, INSTM Venice Research Unit, Via Torino 155/B, 30172 Mestre Venezia, Italy;1. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;2. School of Materials Science and Engineering of Dalian Jiaotong University, Dalian 116028, China;3. Liaoning Institution of Higher Learning Key Laboratory for Environmental Science & Technology, Dalian 116028, China |
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| Abstract: | As a part of the International NOM-Typing Project, proton and copper binding studies were conducted on ultrafiltered (>1000 dal.) and dialysed (>100 dal.) natural organic matter (NOM) samples from eight Norwegian Lakes. The NOM samples were similar with respect to proton and copper binding, although minor differences were observed among the samples of different origin. Slight variations occurred for seasonal changes and lime additions. The proton binding pKa values grouped in three distinct classes: pKa1 = 4.20–4.28; pKa2 = 6.61–6.87; and pKa3 = 9.27–9.8. The average total proton binding site concentration of the NOM samples was: 12.7 meq/g total organic carbon (TOC). Two binding sites were established for copper with average log K1 = 4.84 and log K2 = 7.17. The average site concentration for samples isolated by reverse osmosis (RO) was 0.56 μmol/mg C. Copper binding characteristics appear to be influenced by the method of sample isolation. For NOM isolated by low pressure evaporation (evap), binding site concentrations are smaller, conditional stability constants are higher, variability of the copper complexation capacity is smaller, and correlation with elemental composition (C, N, H) is better than in the case of NOM isolated by RO. |
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