J
John V. Headley
Researcher at Environment Canada
Publications - 230
Citations - 9140
John V. Headley is an academic researcher from Environment Canada. The author has contributed to research in topics: Naphthenic acid & Oil sands. The author has an hindex of 49, co-authored 225 publications receiving 8168 citations. Previous affiliations of John V. Headley include University of Warwick & University of Saskatchewan.
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Journal ArticleDOI
A review of the occurrence and fate of naphthenic acids in aquatic environments.
John V. Headley,Dena W. McMartin +1 more
TL;DR: Environmental persistence results, detailed information regarding the origin of naphthenic acids in tailings ponds, chemistry and toxicological considerations, current analytical methods for aquatic sampling, and areas of future remediation research are brought together.
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Widespread Use and Frequent Detection of Neonicotinoid Insecticides in Wetlands of Canada's Prairie Pothole Region
Anson R. Main,John V. Headley,Kerry M. Peru,Nicole L. Michel,Allan J. Cessna,Christy A. Morrissey +5 more
TL;DR: Distribution maps indicate neonicotinoid use is increasing and becoming more widespread with concerns for environmental loading, while frequently detected neonicsotinoid concentrations in Prairie wetlands suggest high persistence and transport into wetlands.
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In situ bioremediation of naphthenic acids contaminated tailing pond waters in the athabasca oil sands region--demonstrated field studies and plausible options: a review.
TL;DR: The bioremediation techniques have limited success to date in biodegrading NAs to levels below 19 mg/L, and it appears that the remaining high molecular weight NAs are refractory to the natural biodegradation process in the ponds.
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Toxicity assessment of collected fractions from an extracted naphthenic acid mixture
Richard A. Frank,Richard J. Kavanagh,B. Kent Burnison,Gilles Arsenault,John V. Headley,Kerry M. Peru,Glen Van Der Kraak,Keith R. Solomon +7 more
TL;DR: Results support field observations of microbial degradation of low molecular weight NAs decreasing OSPW toxicity, but it is not clear why larger NAs, given their greater hydrophobicity, would be less toxic.
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Human Colon Microbiota Transform Polycyclic Aromatic Hydrocarbons to Estrogenic Metabolites
Tom Van de Wiele,Lynn Vanhaecke,Charlotte Boeckaert,Kerry M. Peru,John V. Headley,Willy Verstraete,Steven D. Siciliano +6 more
TL;DR: The results imply that the PAH bioactivation potency of colon microbiota is not eliminated by the presence of soil, and suggests that current risk assessment may underestimate the risk from ingested PAHs.