Correlations between differential absorbance and the formation of individual DBPs

Water Research
Gregory V KorshinOana Hemingway

Abstract

This study examined correlations between the differential absorbance at 272nm (deltaA272) and the formation of disinfection by-products (DBPs) in chlorinated water from the Tolt River, a water source for Seattle, WA. The DBPs investigated included chloroform (CHCl3), dichlorobromomethane (CHCl2Br), mono-, di- and trichloroacetic acids (MCAA, DCAA, and TCAA, respectively), chloral hydrate (CH), dichloroacetonitrile (DCAN) and 1,1,1-trichloropropanone (TCP). Whereas the kinetics of DBP formation are complex and are non-linear, the same DBP data represented as a function of deltaA272 are quite simple. Absorbance decreases when the water is chlorinated, i.e., deltaA272 is always negative. The DBP vs. -deltaA272 correlations can almost always be quantified by linear equations, at least above some threshold value of -deltaA272, with R2 values > 0.95. The only DBP that did not follow this trend was CH, for which an exponential relationship better described the data. TCP and DCAN were unstable at pH 7 and 8, but at pH 6 linear correlations between their concentrations and -deltaA272 were as strong as those for the more stable DBPs. The threshold -deltaA272 value is approximately the same for many of the DBPs studied, supporting the hyp...Continue Reading

Citations

Apr 27, 2010·Environmental Science and Pollution Research International·Stefan PlatikanovJoaquim C G Esteves da Silva
Mar 16, 2004·Water Research·P WesterhoffH Mash
Jun 26, 2015·Environmental Science and Pollution Research International·Chen LiuHui Sun
May 28, 2005·The Science of the Total Environment·Winn-Jung HuangChun-Chen Wang
Apr 11, 2015·Environmental Science and Pollution Research International·Ting LiCheng Sun
Dec 7, 2011·The Science of the Total Environment·Wei LiuYongmei Liang
Jul 10, 2020·Environmental Monitoring and Assessment·Haroon R MianRehan Sadiq
Dec 19, 2019·Environmental Science and Pollution Research International·Bhuvaneshwari Manivannan, Mikhail Borisover
Sep 8, 2009·Environmental Science & Technology·T BondB Jefferson
Sep 20, 2008·Environmental Science & Technology·Deborah J DryerMassimiliano Fabbricino
Feb 28, 2009·Environmental Science & Technology·Paolo RoccaroGregory V Korshin
Oct 17, 2007·Environmental Science & Technology·Zhuo Chen, Richard L Valentine
May 31, 2007·Environmental Science & Technology·Gregory V KorshinHervé Gallard
Aug 30, 2008·Environmental Science & Technology·Zhuo Chen, Richard L Valentine
Sep 8, 2007·Environmental Science & Technology·Deborah J Dryer, Gregory V Korshin

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