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, R.R., DMITRUK, S.E.: Comparative IR spectral characteristics of humic acids from peats of different origin in the Tomsk area. Pharm. Chem. J., 43, 2009, 418-421. GU, B., LEBOEF, E.J., PAN, H., DAI, S.: Spectroscopic characterization of the structural and functional properties of natural organic matter fractions. Chemosphere, 48, 2002, 59-68. HARVEY, G.R., BORAN, D.A., CHESAL, L.A., TOKAR, J.M.: The structure of Marine fulvic and humic acids. Marine Chem., 12, 1983, 119-132. HSU, J.H., LO, S.L.: Chemical and spectroscopic analysis of organic matter transformation

.: Characteristics of natural organic matter removed from water along with its treatment , Environmental Protection Engineering 42 (2016) 183–195. 23. Urbanowska A., Kabsch-Korbutowicz M.: The properties of NOM particles removed from water in ultrafiltration, ion exchange and integrated processes , Desalination and Water Treatment, 57(2016) 13453-13461. 24. Manufacturer’s specification Klimapol (Praestol).

References [1] ZOUBOULIS, A. I., JUN, W., KATSOYIANNIS, I. A. Removal of humic acids by flotation. Minerals Engineering , vol. 20, 2004, no 9, p. 945-949. [2] KABSCH-KORBUTOWICZ, M. Effect of Al coagulant type on natural organic matter removal efficiency in coagulation/ultrafiltration process. Desalination, vol. 185, 2005, p. 327-333. [3] GREGORY, J. E., NOKES, C. J., FENTON, E. Optimizing natural organic matter removal from low turbidity waters by controlled pH adjustment of aluminum coagulant. Water research, vol. 31, 1997, no 12, p. 2949-2958. [4

Dissolved organic matter concentration changes in river waters of Latvia

Amounts of natural organic matter in surface waters reflect the character and intensity of biological processes in water bodies, human impact and depend on the physico-geographical environment and land-use in the catchments. Thus, analysis of the concentrations and loadings of organic substances to adjacent water bodies can be used to indicate environmental change and human impacts. This study revealed significant increasing trends of total organic carbon (TOC) and water colour in most of the studied Latvian rivers during the last decade. However, over longer time periods, there have been pronounced oscillations of TOC concentrations, stressing the importance of long-term changes of river discharge. On a yearly basis, there was a positive correlation between parameters of organic matter concentration and discharge in all selected rivers. The impact of discharge on concentrations of organic matter can be masked by other factors, such as changes in precipitation, biological processes, soil types and land-use.

., 1994: Molecular weight, polydispersity and spectroscopic properties of aquatic humic substances. Environ. Sci. Tech. , 28, 1853-1858. CHOW C. W. K., van LEEUWEN J. A., DRIKAS M., FABRIS R., SPARK K.M., PAGE D.W., 1999: The impact of the character of natural organic matter in conventional treatment with alum. Wat. Sci. Technol. , 40, 97-104. CROUE J. P., LEFEBVRE E., MARTIN B., LEGUBE B., 1993: Removal of dissolved hydrophobic and hydrophilic organic substances during coagulation/flocculation of surface waters. Wat. Sci. Technol. , 27, 143-152. DAWSON R

haloacetic acids from water using bioreactor with native enzymes. Membranes and Membrane Processes in Environmental Protection, Monografie Komitetu Inżynierii Środowiska PAN, 49–59. 12. Jung, C and Son, H 2008. The relationship between disinfection by-products formation and characteristics of natural organic matter in raw water. Korean Journal of Chemical Engineering 25, 4, 714–720. 13. Gregory, J and Duan, V 2014. Properties of flocs produced by water treatment coagulants. Water Sci. Technol.44(10), 231-236. 14. Moncayo-Lasso, A, Pulgarin C and Benitez, N 2008

exemplified on modernized water treatment plant at Otoczna , Civil and Enviromental Engineering Reports, 13 (2): 049-062. 6. Kowal, AL and Świderska-Bróż, M 2009. Oczyszczanie wody . PWN, Warszawa. 7. Krupińska, I 2018. Removal of natural organic matter from groundwater by coagulation using prehydrolysed and non - prehydrolysed coagulants. Desalination and Water Treatment 132 , 244-252. 8. Piekarski, J, Piecuch, T and Bartkiewicz, B 2000. Praktyczne aspekty wydłużenia czasu pracy kolumny sorpcyjnej bez wspomagania oraz z wspomaganiem z poprzedzającym złożem filtracyjnym

References 1. Zhan, Y., Lin, J., Qiu, Y., Gao, N. & Zhu, Z. (2011). Adsorption of humic acid from aqueous solution on bilayer hexadecyltrimethyl ammonium bromide-modified zeolite. Front.Environ. Sci. Engin. Chin. 5, 65-75. DOI: 10.1007/s11783-010- 0277-z. 2. Lesley, J., Flora, J.R.V., Park, Y., Badawy, M., Hazem, S. & Yoon, Y. (2012). Removal of natural organic matter from potential drinking water sources by combined coagulation and adsorption using carbon nanomaterials. Sep. Purif. Technol. 95, 64-72. DOI: 10.1016/j.seppur.2012.04.033. 3. Huang, W.J. & Yeh

molecules. Environmental Science and Technology, 33, 1682-1690. Conte, P., Spaccini, R., Piccolo, A., 2004. State of the art of CPMAS 13C-NMR spectroscopy applied to natural organic matter. Progress in Nuclear Magnetic Resonance Spectroscopy, 44, 215-223. Conte, P., Bubici, S., Palazzolo, E., Alonzo, G., 2009. Solid- State H-1-NMR Relaxation Properties of the Fruit of a Wild Relative of Eggplant at Different Proton Larmor Frequencies. Spectroscopy Letters, 42, 235-239. Conte, P., Piccolo, A., Van Lagen, B., Buurman, P., Hemminga, M.A., 2002. Elemental quantitation of

-8026. KARCZEWSKA A. 2008. Ochrona gleb i rekultywacja terenów zdegradowanych. Wydawnictwo Uniwersytetu Przyrodniczego we Wrocławiu, 235 KUNGOLOS A., SAMARAS P., TSIRIDIS V., PETALA M., SAKEL-LAROPOULOS G. 2006. Bioavailability and Toxicity of Heavy Metals in the Presence of Natural Organic Matter. Journal of Environmental Science and Health Part A 41:1509-1517. LAMELAS C., WILKINSON K.J., SLAVEYKOVA V.I. 2005. Influence of the composition of natural organic matter on Pb bio-availability to microalgae. Environmental Science Technology 39: 6109-6116. LAVADO R.S. 2006