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Chlorination experiments were conducted with water samples from Terkos Lake (TL) and B\u00fcy\u00fck\u00e7ekmece Lake (BL) (Istanbul, Turkey). The maximum loss of UV absorbance for chlorinated TL and BL raw water samples was observed at a wavelength of 272\u2009nm. Interestingly, differential absorbance at 272\u2009nm (\u0394UV<jats:sub>272<\/jats:sub>) was shown to be a good indicator of UV absorbing chromophores and the formation of trihalomethanes (THMs) resulting from chlorination. Furthermore, differential spectra of chlorinated TL waters were similar for given chlorination conditions, peaking at 272\u2009nm. The correlations between THMs and \u0394UV<jats:sub>272<\/jats:sub> were quantified by linear equations with <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> values &gt;0.96. The concentration of THMs formed when natural organic matter is chlorinated increases with increasing time and pH levels. Among all THMs, CHCl<jats:sub>3<\/jats:sub> was the dominant species forming as a result of the chlorination of TL and BL raw water samples. The highest chloroform (CHCl<jats:sub>3<\/jats:sub>), dichlorobromomethane (CHCl<jats:sub>2<\/jats:sub>Br), and dibromochloromethane (CHBr<jats:sub>2<\/jats:sub>Cl)  concentration were released per unit loss of absorbance at 272\u2009nm at pH 9 with a maximum reaction time of 168 hours and Cl<jats:sub>2<\/jats:sub>\/dissolved organic carbon ratio of 3.2.<\/jats:p>","DOI":"10.1155\/2013\/890854","type":"journal-article","created":{"date-parts":[[2013,12,2]],"date-time":"2013-12-02T21:01:59Z","timestamp":1386018119000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Assessment of Trihalomethane Formation in Chlorinated Raw Waters with Differential UV Spectroscopy Approach"],"prefix":"10.1155","volume":"2013","author":[{"given":"Kadir","family":"\u00d6zdemir","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"\u0130smail","family":"Tor\u00f6z","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vedat","family":"Uyak","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,12,2]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1021\/es9914590"},{"key":"e_1_2_6_2_2","first-page":"1398","volume-title":"The Encyclopedia of Environmental Analysis and Remediation","author":"Richardson S. 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