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Assessing Additivity of Cytotoxicity Associated with Disinfection Byproducts in Potable Reuse and Conventional Drinking Waters

Lau, Stephanie S., Wei, Xiao, Bokenkamp, Katherine, Wagner, Elizabeth D., Plewa, Michael J., Mitch, William A.·2020·Environmental Science & Technology

Abstract

values to estimate the DBP-associated cytotoxicity of disinfected waters. This approach assumed that cytotoxicity was additive rather than synergistic or antagonistic. In this study, we evaluated whether this assumption was valid for mixtures containing DBPs at the concentration ratios measured in authentic disinfected waters. We examined the CHO cell cytotoxicity of defined DBP mixtures based on the concentrations of 43 regulated and unregulated DBPs measured in eight drinking and potable reuse waters. The hypothesis for additivity was supported using three experimental approaches. First, we demonstrated that the calculated additive toxicity (CAT) and bioassay-based calculated additive toxicity (BCAT) of the DBP mixtures agree within 12% on a median basis. We also found an additive toxicity response (CAT ≈ BCAT) between the regulated and unregulated DBP classes. Finally, the empirical biological cytotoxicity of the DBP subset mixtures, independent of the calculated toxicity, was additive. These results support the validity of using the sum of cytotoxic potency-weighted DBP concentrations as an estimate of the CHO cell cytotoxicity associated with known DBPs in real disinfected waters.

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Metadata

Authors
Lau, S. S., Wei, X., Bokenkamp, K., Wagner, E. D., Plewa, M. J., & Mitch, W. A.
Venue
Environmental Science & Technology
Published
2020-04-10
Volume
54
Issue
9
Pages
5729-5736
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W3015513240
Cited by
194
References
5
FWCI
8.94
Type
journal article
Language
en
Open access
closed

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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