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Chemosphere

Title:		The natural chlorine cycle - Formation of the carcinogenic and greenhouse gas compound chloroform in drinking water reservoirs
Author(s):		Forczek ST; Pavlik M; Holik J; Rederer L; Ferencik M;
Address:		"Isotope Laboratory, Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Videnska 1083, CZ-14220, Prague, Czech Republic. Electronic address: alex067@biomed.cas.cz. Isotope Laboratory, Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Videnska 1083, CZ-14220, Prague, Czech Republic. Povodi Labe, State Enterprise, Vita Nejedleho 951, CZ-50003, Hradec Kralove, Czech Republic. Povodi Labe, State Enterprise, Vita Nejedleho 951, CZ-50003, Hradec Kralove, Czech Republic; Institute of Environmental and Chemical Engineering, Faculty of Chemical Technology, University of Pardubice, Studentska 573, CZ-53210, Pardubice, Czech Republic"
Journal Title:		Chemosphere
Year:		2016
Volume:		20160524
Issue:
Page Number:		190 - 199
DOI:		10.1016/j.chemosphere.2016.05.017
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"Chlorine cycle in natural ecosystems involves formation of low and high molecular weight organic compounds of living organisms, soil organic matter and atmospherically deposited chloride. Chloroform (CHCl3) and adsorbable organohalogens (AOX) are part of the chlorine cycle. We attempted to characterize the dynamical changes in the levels of total organic carbon (TOC), AOX, chlorine and CHCl3 in a drinking water reservoir and in its tributaries, mainly at its spring, and attempt to relate the presence of AOX and CHCl3 with meteorological, chemical or biological factors. Water temperature and pH influence the formation and accumulation of CHCl3 and affect the conditions for biological processes, which are demonstrated by the correlation between CHCl3 and SigmaAOX/Cl(-) ratio, and also by CHCl3/SigmaAOX, CHCl3/AOXLMW, CHCl3/SigmaTOC, CHCl3/TOCLMW and CHCl3/Cl(-) ratios in different microecosystems (e.g. old spruce forest, stagnant acidic water, humid and warm conditions with high biological activity). These processes start with the biotransformation of AOX from TOC, continue via degradation of AOX to smaller molecules and further chlorination, and finish with the formation of small chlorinated molecules, and their subsequent volatilization and mineralization. The determined concentrations of chloroform result from a dynamic equilibrium between its formation and degradation in the water; in the Hamry water reservoir, this results in a total amount of 0.1-0.7 kg chloroform and 5.2-15.4 t chloride. The formation of chloroform is affected by Cl(-) concentration, by concentrations and ratios of biogenic substrates (TOC and AOX), and by the ratios of the substrates and the product (feedback control by chloroform itself)"
Keywords:		"Air Pollutants/analysis Carcinogens/analysis Chlorine/*analysis Chloroform/analysis Czech Republic Drinking Water/*analysis/chemistry Gases/analysis Greenhouse Effect Hydrocarbons, Halogenated/*analysis Lakes/*analysis/chemistry Rivers/chemistry Water Pol;"
Notes:		"MedlineForczek, Sandor T Pavlik, Milan Holik, Josef Rederer, Ludek Ferencik, Martin eng England 2016/05/28 Chemosphere. 2016 Aug; 157:190-9. doi: 10.1016/j.chemosphere.2016.05.017. Epub 2016 May 24"