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Comparing winter-time herbicide behavior and exports in urban, rural, and mixed-use watersheds
Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Canada.
Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Canada.
Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Canada.
Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Canada.
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2018 (English)In: Environmental Science: Processes & Impacts, ISSN 2050-7887, E-ISSN 2050-7895, Vol. 20, no 5, p. 767-779Article in journal (Refereed) Published
Abstract [en]

The presence of pesticides in streams in winter, five to six years following bans on their municipal use suggests that complicated transport behaviour, such as subsurface retention and/or accumulation of pesticides and its release during storms, could be important for understanding recovery time frames following bans or legislation that aim to reduce chemical inputs. We investigated late fall and winter dynamics of four herbicides in paired urban and rural watersheds in Toronto, Canada during rainfall and snowmelt. The range of average concentrations and loads of the sum of atrazine, metolachlor, 2,4-D and mecoprop overlapped in the two types of watersheds, with slightly higher average concentrations in the rural watershed. Relatively consistent herbicide concentration-discharge patterns (i. e. dilution) were observed in the urban sub-watersheds during rainfall, while concentration-discharge patterns were much more variable in the rural watershed. This suggests relatively uniform transport pathways across the urban sub-watersheds, compared to the rural watershed. Concentration-discharge patterns of the neutral herbicides atrazine and metolachlor were similar in both watersheds during snowmelt, though varying discharge patterns resulted in divergent timings of peak concentrations. In contrast, the acidic pesticides 2,4-D and mecoprop, which are primarily associated with urban uses, showed much more variable behavior across both watersheds and merit further investigation. Overall, this work highlights the need to consider pesticide dynamics throughout the year in order to more thoroughly assess the longterm efficacy of legislation governing their use.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018. Vol. 20, no 5, p. 767-779
National Category
Analytical Chemistry Environmental Sciences
Identifiers
URN: urn:nbn:se:oru:diva-67271DOI: 10.1039/c7em00596bISI: 000433191900005PubMedID: 29578561Scopus ID: 2-s2.0-85047605361OAI: oai:DiVA.org:oru-67271DiVA, id: diva2:1218957
Note

Funding Agencies:

Natural Sciences and Engineering Research Council of Canada  

FedDev Ontario  

Ontario Ministry of Research and Innovation via the Southern Ontario Water Consortium  

Ontario Graduate Scholarship  

TD Canada Trust 

Available from: 2018-06-15 Created: 2018-06-15 Last updated: 2018-06-15Bibliographically approved

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Yeung, Leo W. Y.

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