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Issue 7, 2017
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A field analysis of lampricide photodegradation in Great Lakes tributaries

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The lampricides 3-trifluoromethyl-4-nitrophenol (TFM) and 2′,5-dichloro-4′-nitrosalicylanilide (niclosamide) are added to Great Lakes tributaries to target the sea lamprey, an invasive parasitic fish. This study examines the photochemical behavior of the lampricides in Carpenter Creek, Sullivan Creek, and the Manistique River. The observed loss of TFM in Carpenter and Sullivan Creeks (i.e., 34 and 19%) was similar to the loss of bromide in parallel time of passage studies (i.e., 30 and 29%), demonstrating that TFM photodegradation was minimal in both tributaries during the lampricide application. Furthermore, the absence of inorganic and organic photoproducts in the Manistique River demonstrates that TFM and niclosamide photodegradation was minimal in this large tributary, despite its long residence time (i.e., 3.3 days). Kinetic modeling was used to identify environmental variables primarily responsible for the limited photodegradation of TFM in the field compared to estimates from laboratory data. This analysis demonstrates that the lack of TFM photodegradation was attributable to the short residence times in Carpenter and Sullivan Creeks, while depth, time of year, time of day, and cloud cover influenced photochemical fate in the Manistique River. The modeling approach was extended to assess how many of the 140 United States tributaries treated with lampricides in 2015 and 2016 were amenable to TFM photolysis. While >50% removal of TFM due to photolysis could occur in 13 long and shallow tributaries, in most systems lampricides will reach the Great Lakes untransformed.

Graphical abstract: A field analysis of lampricide photodegradation in Great Lakes tributaries

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The article was received on 10 Apr 2017, accepted on 23 May 2017 and first published on 23 May 2017

Article type: Paper
DOI: 10.1039/C7EM00173H
Environ. Sci.: Processes Impacts, 2017,19, 891-900

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    A field analysis of lampricide photodegradation in Great Lakes tributaries

    M. B. McConville, N. M. Cohen, S. M. Nowicki, S. R. Lantz, J. L. Hixson, A. S. Ward and C. K. Remucal, Environ. Sci.: Processes Impacts, 2017, 19, 891
    DOI: 10.1039/C7EM00173H

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