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19 results on '"Sekela, Mark"'

2. Perfluoroalkyl acids in the Canadian environment: Multi-media assessment of current status and trends

Author

Gewurtz, Sarah B., Backus, Sean M., De Silva, Amila O., Ahrens, Lutz, Armellin, Alain, Evans, Marlene, Fraser, Susan, Gledhill, Melissa, Guerra, Paula, Harner, Tom, Helm, Paul A., Hung, Hayley, Khera, Nav, Kim, Min Gu, King, Martha, Lee, Sum Chi, Letcher, Robert J., Martin, Pamela, Marvin, Chris, McGoldrick, Daryl J., Myers, Anne L., Pelletier, Magella, Pomeroy, Joe, Reiner, Eric J., Rondeau, Myriam, Sauve, Marie-Claude, Sekela, Mark, Shoeib, Mahiba, Smith, Daniel W., Smyth, Shirley Anne, Struger, John, Spry, Doug, Syrgiannis, Jim, and Waltho, Jasmine

Published
2013
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5. Organic Contaminants and Fish

Author

Tierney, Keith B., primary, Kennedy, Christopher J., additional, Gobas, Frank, additional, Gledhill, Melissa, additional, and Sekela, Mark, additional

Published
2013
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8. Investigation of Spatial Distributions and Temporal Trends of Triclosan in Canadian Surface Waters.

Author

Garron, Christine, Dove, Alice, Struger, John, Farmer, Kristina, Sekela, Mark, Gledhill, Melissa, Backus, Sean, and Lalonde, Benoit

Subjects
SPATIAL distribution (Quantum optics), TEMPORAL distribution (Quantum optics), TRICLOSAN, WATER, CANADIAN Environmental Protection Act
Abstract

Triclosan is widely used in personal care products (skin creams, toothpastes, soaps, deodorants, body spray) and cleaning products (dishwashing detergent and all-purpose cleaners) (Halden in Environ Sci Technol 48:3603-3611, 2014). In 2001, it was selected for screening-level risk assessment under the Canadian Environmental Protection Act (HC and EC in Preliminary assessment. Triclosan. Chemical abstracts Service Number 3380-34-5, 2012. http://www.ec.gc.ca/ese-ees/default.asp?lang=En&n=6EF68BEC-1), and its physicochemical and toxicological characteristics indicate that there may be a risk to aquatic environments due to releases of the chemical in Canada. A surveillance initiative across Canada has included sampling at 44 sites from July 2012 to March 2018. Triclosan was detected in 226 of 918 samples; concentrations ranged from less than 6 to 874 ng L−1, and the detections averaged 54.23 ng L−1 (standard deviation; 97.6 ng L−1). However, using the entire dataset (including censored data estimated with the Kaplan-Meier model), the mean triclosan concentration was 17.95 ng L−1, and the standard deviation was 52.84 ng L−1. Three samples at Wascana Creek (downstream), Saskatchewan, had concentrations above the Federal Environmental Quality Guidelines of 470 ng L−1, indicating a potential risk to the aquatic ecosystem. In this study, triclosan in samples collected downstream from municipal wastewater treatment plant discharges usually demonstrated higher concentrations than upstream samples. Based on the results of this study, it is hypothesized that triclosan concentration have fluctuated between years of this study but not in an overall or significant increase or decreasing trend. Triclosan concentrations and detections also are more prevalent in urban than in rural or mixed development rivers. Performance evaluation of triclosan concentrations in the Canadian environment is scheduled to be reassessed by 2024. Therefore, a 3-year sampling program should be in place across Canada by 2021. [ABSTRACT FROM AUTHOR]

Published
2019
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13. Occurrence of glyphosate and acidic herbicides in select urban rivers and streams in Canada, 2007

Author

Glozier, Nancy E., primary, Struger, John, additional, Cessna, Allan J., additional, Gledhill, Melissa, additional, Rondeau, Myriam, additional, Ernst, William R., additional, Sekela, Mark A., additional, Cagampan, Steve J., additional, Sverko, Ed, additional, Murphy, Clair, additional, Murray, Janine L., additional, and Donald, David B., additional

Published
2011
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16. Spatial trends of polybrominated diphenyl ethers in Canadian fish and implications for long-term monitoring

Author

Gewurtz, Sarah B., primary, McGoldrick, Daryl J., additional, Clark, Mandi G., additional, Keir, Michael J., additional, Malecki, Mary M., additional, Gledhill, Melissa, additional, Sekela, Mark, additional, Syrgiannis, Jim, additional, Evans, Marlene S., additional, Armellin, Alain, additional, Pomeroy, Joe, additional, Waltho, Jasmine, additional, and Backus, Sean M., additional

Published
2011
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