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An improved exposure assessment of DBP [disinfection byproduct] formation and its association with adverse health effects

An improved exposure assessment of DBP [disinfection byproduct] formation and its association with adverse health effects. Graziano, Nicole; Amy, Gary; Krasner, Stuart W.; Frey, Michelle ( McGuire Environmental Consultants, Inc.Chemicals with cas numbers 75-96-7 and 71133-14-7 also play role., USA). Proceedings - Water Quality Technology Conference, 133-141 (English) 2002 American Water Works Association. CODEN: PWQCD2. ISSN: 0164-0755. DOCUMENT TYPE: Journal; (computer optical disk) CA Section: 61 (Water) Section cross-reference(s): 4 An improved exposure assessment is proposed for the re-anal. of two well-conducted, peer-reviewed epidemiol. studies that reported an increased risk of bladder cancer assocd. with chlorinated drinking water and trihalomethanes in Iowa and Ontario. The proposed assessment method uses exposure models and correlation studies. For each modeling site, two approaches were used: modeling the data based on a central tendency model and modeling the data on a site-specific basis with a case study approach. .

The reactivity of dissolved organic matter for disinfection by-product formation

The reactivity of dissolved organic matter for disinfection by-product formation. Kitis, Mehmet; Karanfil, Tanju; Kilduff, James E. (Department of Environmental Engineering, Suleyman Demirel University, Isparta 32260, Turk.). Turkish Journal of Engineering & Environmental Sciences, 28(3), 167-179 (English) 2004 Scientific and Technical Research Council of Turkey. CODEN: TJESEC. ISSN: 1300-0160. DOCUMENT TYPE: Journal CA Section: 61 (Water) Dissolved org. matter (DOM) in 6 water samples collected from 4 surface waters was fractionated using some or all of 5 physicochem. sepn. processes (activated C and XAD-8 batch adsorption, alum coagulation, ultrafiltration (UF), and XAD-8 column fractionation). Activated C, XAD-8 batch adsorption, and alum coagulation processes fractionated DOM by preferentially removing high-specific UV absorbance (SUVA) components from soln. The XAD-8 column method fractionated DOM into hydrophobic and hydrophilic components; UF sepd. DOM into different size fractions. More than 40 DOM fractions, characterized using C-normalized SUVA, were obtained for each water. Trihalomethane (THM) and haloacetic acid (HAA9) formation following chlorination was quantified for each fraction. For each natural water, a strong correlation was obsd. between SUVA values of DOM fractions and their THM and HAA9 formation, independent of the sepn. processes used to obtain those fractions. Thus, the correlation obtained for each water appears to represent its natural disinfection byproduct (DBP) reactivity profile; however, SUVA is not a universal predictor of DOM reactivity since a unique DBP reactivity profile was obtained for each water tested.In this experiment, several chemicals are used like 71133-14-7 and 74-82-8 The SUVA distribution within a source water and its relationship to reactivity were more informative than the source water aggregate SUVA value. Individual DBP species also correlated well with DOM fraction SUVA in a single water. Trichloroacetic acid (TCAA) formation was dominant over dichloroacetic acid (DCAA) for high-SUVA fractions; TCAA and DCAA formation was comparable for low-SUVA fractions. .