Exposure Assessment of Pesticides in Surface Waters of Ontario, Canada Reveals Low Probability of Exceeding Acute Regulatory Thresholds.

Autor: Desrochers D; Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada., Prosser RS; University of Guelph, School of Environmental Sciences, Guelph, ON, Canada., Hanson ML; Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada., Rodríguez-Gil JL; Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada. jlrodriguez@iisd-ela.org.; IISD - Experimental Lakes Area, Winnipeg, MB, Canada. jlrodriguez@iisd-ela.org.
Jazyk: angličtina
Zdroj: Bulletin of environmental contamination and toxicology [Bull Environ Contam Toxicol] 2024 Apr 02; Vol. 112 (4), pp. 53. Date of Electronic Publication: 2024 Apr 02.
DOI: 10.1007/s00128-024-03879-w
Abstrakt: The objectives of this study were to: (1) characterize the exposure of aquatic ecosystems in Southern Ontario, Canada to pesticides between 2002 and 2016 by constructing environmental exposure distributions (EEDs), including censored data; and (2) predict the probability of exceeding acute regulatory guidelines. Surface water samples were collected over a 15-year period by Environment and Climate Change Canada. The dataset contained 167 compounds, sampled across 114 sites, with a total of 2,213 samples. There were 67,920 total observations of which 55,058 were non-detects (81%), and 12,862 detects (19%). The most commonly detected compound was atrazine, with a maximum concentration of 18,600 ngL - 1 and ~ 4% chance of exceeding an acute guideline (1,000 ngL - 1 ) in rivers and streams. Using Southern Ontario as a case study, this study provides insight into the risk that pesticides pose to aquatic ecosystems and the utility of EEDs that include censored data for the purpose of risk assessment.
(© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
Externí odkaz: