Effects of enhanced coagulation on polar halogenated disinfection byproducts in drinking water

Precursor ion scans using electrospray ionization-triple quadrupole mass spectrometry with or without ultra performance liquid chromatography preseparation were employed to examine the effects of enhanced/conventional coagulation on the formation of polar halogenated disinfection byproducts (DBPs) during chlorination. It is of interest that many new polar halogenated DBPs were generated as a consequence of enhanced or conventional coagulation, and a number of them were nitrogenous DBPs and/or had m/z values larger than 250. Some of the new polar halogenated DBPs showed up only in samples with enhanced coagulation but not in samples with conventional coagulation, although enhanced coagulation was better for controlling the overall DBP formation. The results suggest that the fraction of natural organic matter resistant to be removed by coagulation should have a low reaction potential with halogens; after enhanced or conventional coagulation, halogens are forced to react with the remaining fraction of natural organic matter, producing new polar (nitrogenous) halogenated DBPs. In addition, enhanced coagulation altered the speciation of halogenated DBPs by elevating the ratio of bromine-containing to chlorine-containing DBPs; this phenomenon was observed for both polar and apolar halogenated DBPs, but polar DBPs were more susceptible to be altered.

[1]  S. Richardson,et al.  Comparative mammalian cell toxicity of N-DBPs and C-DBPs , 2008 .

[2]  Yin-Tak Woo,et al.  Haloacetonitriles vs. regulated haloacetic acids: are nitrogen-containing DBPs more toxic? , 2007, Environmental science & technology.

[3]  G. Vanloon,et al.  Using Coagulants to remove organic matter , 2000 .

[4]  Yuefeng F. Xie.  Disinfection Byproducts in Drinking Water : Formation, Analysis, and Control , 2003 .

[5]  D. Reckhow,et al.  Comparison of disinfection byproduct formation from chlorine and alternative disinfectants. , 2007, Water research.

[6]  Zhangsheng Wang,et al.  Mechanism study of the coagulant impact on mutagenic activity in water , 2000 .

[7]  S. Niksa,et al.  Characteristics of nitrogen-containing aromatic compounds in coal tars during secondary pyrolysis , 1999 .

[8]  D. Reckhow,et al.  Characterization of disinfection byproduct precursors based on hydrophobicity and molecular size. , 2007, Environmental science & technology.

[9]  P. Westerhoff,et al.  Reactivity of natural organic matter with aqueous chlorine and bromine. , 2004, Water research.

[10]  J. Talley,et al.  Fast selective detection of polar brominated disinfection byproducts in drinking water using precursor ion scans. , 2008, Environmental science & technology.

[11]  D. DeMarini,et al.  Occurrence, genotoxicity, and carcinogenicity of regulated and emerging disinfection by-products in drinking water: a review and roadmap for research. , 2007, Mutation research.

[12]  Krishna Gopal,et al.  Chlorination byproducts, their toxicodynamics and removal from drinking water. , 2007, Journal of hazardous materials.

[13]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[14]  Jun Ma,et al.  Indecisiveness of electrophoretic mobility determination in evaluating Fe(III) coagulation performance , 2009 .

[15]  Sylvia E. Barrett,et al.  Characterization of high molecular weight disinfection byproducts from chlorination of humic substances with/without coagulation pretreatment using UF-SEC-ESI-MS/MS. , 2005, Environmental Science and Technology.

[16]  Xiangru Zhang,et al.  Is electrophoretic mobility determination meaningful for aluminum(III) coagulation of kaolinite suspension? , 2008, Journal of colloid and interface science.

[17]  S. Itoh,et al.  Contribution of brominated organic disinfection by-products to the mutagenicity of drinking water. , 2004, Water science and technology : a journal of the International Association on Water Pollution Research.