Trace Analysis of 61 Emerging Br-, Cl-, and I-DBPs: New Methods to Achieve Part-Per-Trillion Quantification in Drinking WaterClick to copy article linkArticle link copied!
- Amy A. CuthbertsonAmy A. CuthbertsonDepartment of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United StatesMore by Amy A. Cuthbertson
- Hannah K. LiberatoreHannah K. LiberatoreDepartment of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United StatesMore by Hannah K. Liberatore
- Susana Y. KimuraSusana Y. KimuraDepartment of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United StatesDepartment of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, CanadaMore by Susana Y. Kimura
- Joshua M. AllenJoshua M. AllenDepartment of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United StatesMore by Joshua M. Allen
- Alena V. BensussanAlena V. BensussanDepartment of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United StatesMore by Alena V. Bensussan
- Susan D. Richardson*Susan D. Richardson*Phone: 803-777-6932. Fax: 803-777-9521. E-mail: [email protected]Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United StatesMore by Susan D. Richardson
Abstract
Disinfection byproducts (DBPs) are a ubiquitous source of chemical exposure in drinking water and have been associated with serious health impacts in human epidemiologic studies. While toxicology studies have pinpointed DBPs with the greatest toxic potency, analytical methods have been lacking for quantifying complete classes of most toxic DBPs at sufficiently low quantification limits (ng/L). This new method reports the parts-per-trillion quantification for 61 toxicologically significant DBPs from 7 different chemical classes, including unregulated iodinated haloacetic acids (HAAs) and trihalomethanes (THMs), haloacetaldehydes, haloketones, haloacetonitriles, halonitromethanes, and haloacetamides, in addition to regulated HAAs and THMs. The final optimized method uses salt-assisted liquid–liquid extraction in a single extraction method for a wide range of DBPs, producing the lowest method detection limits to-date for many compounds, including highly toxic iodinated, brominated, and nitrogen-containing DBPs. Extracts were divided for the analysis of the HAAs (including iodinated HAAs) by diazomethane derivatization and analysis using a GC-triple quadrupole mass spectrometer with multiple reaction monitoring, resulting in higher signal-to-noise ratios, greater selectivity, and improved detection of these compounds. The remaining DBPs were analyzed using a GC-single quadrupole mass spectrometer with selected ion monitoring, utilizing a multimode inlet allowed for lower injection temperatures to allow the analysis of thermally labile DBPs. Finally, the use of a specialty-phase GC column (Restek Rtx-200) significantly improved peak shapes, which improved separations and lowered detection limits. Method detection limits for most DBPs were between 15 and 100 ng/L, and relative standard deviations in tap water samples were mostly between 0.2 and 30%. DBP concentrations in real samples ranged from 40 to 17 760 ng/L for this study.
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