Jump to main content
Jump to site search


Indirect photodegradation of the lampricides TFM and niclosamide

Author affiliations

Abstract

3-Trifluromethyl-4-nitrophenol (TFM) and 2′,5-dichloro-4′-nitrosalicylanilide (niclosamide) are lampricides used in tributaries of the Great Lakes to kill the invasive parasitic sea lamprey (Petromyzon marinus). Although the lampricides have been applied since the late 1950s, their photochemical behavior in natural environments is still not well understood. This study examines the indirect photodegradation of these two compounds and the resulting yields of organic and inorganic photoproducts in water samples collected from five tributaries of Lake Michigan. The tributaries were selected to span the length of Lake Michigan and its natural carbonate geologic gradient. In the presence of dissolved organic matter (DOM), the niclosamide photodegradation rate triples, while the rate of TFM photodegradation is unchanged. Additionally, the yield of lampricide organic products is influenced by DOM because many of the organic photoproducts themselves are prone to DOM-mediated indirect photodegradation. The indirect photodegradation of niclosamide is primarily mediated by reaction with singlet oxygen, which accounts for more than 50% of the increased photodegradation rate. Additionally, hydroxyl radicals and carbonate radicals (CO3˙) influence niclosamide indirect photolysis, and their contribution is dependent on the specific river water chemistry. For example, CO3˙ contribution to niclosamide photodegradation, while small, is greater in southern tributaries where there is higher carbonate alkalinity.

Graphical abstract: Indirect photodegradation of the lampricides TFM and niclosamide

Back to tab navigation

Supplementary files

Publication details

The article was received on 06 May 2017, accepted on 21 Jun 2017 and first published on 22 Jun 2017


Article type: Paper
DOI: 10.1039/C7EM00208D
Citation: Environ. Sci.: Processes Impacts, 2017, Advance Article
  •   Request permissions

    Indirect photodegradation of the lampricides TFM and niclosamide

    M. B. McConville, S. P. Mezyk and C. K. Remucal, Environ. Sci.: Processes Impacts, 2017, Advance Article , DOI: 10.1039/C7EM00208D

Search articles by author

Spotlight

Advertisements