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Found 10 records similar to Concentrations of perfluoroalkyl acids (PFAAs) in snow on the Devon Ice Cap, Nunavut, Canada

Federal

This dataset contains concentrations of perfluoroalkyl substances (PFAS) in seawater sampled in various locations in the Arctic ranging from 2005-2008. Perfluoroalkyl acids (PFAAs) are ubiquitous contaminants of marine, freshwater and terrestrial environments, including remote arctic wildlife. Slow, and long-range oceanic transport from source regions in the northern hemisphere is hypothesized to be among the major pathways contributing to PFAA contamination in remote marine environments. The Arctic Ocean is influenced by Pacific and Atlantic seawater as well as riverine outflows.

Last Updated: Jul. 29, 2021
Date Published: Sep. 4, 2018
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Arctic, Bering Strait, Chukchi Sea, Mackenzie Bay, Amundsen Gulf, Coronation Gulf, Victoria Strait, Barrow Strait, Resolute Bay
Federal

The delivery of perfluoroalkyl substances (PFAS) from snowpacks into Lake Hazen, located on Ellesmere Island (Nunavut, Canada) indicates that annual atmospheric deposition is a major source of PFAS that undergo complex cycling in the High Arctic. Perfluoroalkyl carboxylic acids (PFCA) in snowpacks display odd-even concentration ratios characteristic of long-range atmospheric transport and oxidation of volatile precursors. This Dataset contains the concentrations of perfluoroalkyl substances (PFAS) in Arctic water and snow for Lake Hazen. Snow samples were collected from 2013-2014, water samples were collected over a time span of 2012-2015.

Last Updated: Aug. 2, 2022
Date Published: Mar. 30, 2020
Organization: Environment and Climate Change Canada
Formats: HTML CSV
Keywords:  Water quality, Northern Canada, Ellesmere Island, Arctic, Lake Hazen, Environment, Water quality, Perfluoroalkyl substances (PFAS), Water Sampling
Federal

Temporal trends and climate related parameters affecting the fate of legacy persistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) were examined in landlocked Arctic char from four lakes in the Canadian Arctic. Among biological parameters, lipid content was a key factor explaining the concentration of most POPs in Arctic char. Legacy PCBs and OCPs generally showed declining trends of concentrations in Arctic char, consistent with past restriction on uses and emissions of POPs. However, increases in lake primary productivity (measured as chlorophyll a) exerted a dilution effect on POPs concentrations in Arctic char.

Last Updated: Jul. 23, 2021
Date Published: Jun. 19, 2018
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Northern Contaminants Program (NCP), Arctic Char, Fishes, Persistent organic pollutants (POPs), Char Lake, Cornwallis Island, Ellesmere Island, Kent Peninsula, Lake Amituk
Federal

This data set contains concentrations of perfluoroalkyl and polyfluoroalkyl substances (PFAS) in wastewater Influent (INF), Effluent (EFF), Landfill Leachate (LCH), Biosolids (BIOS) and Sludge (SLG) sampled from various Wastewater Treatment Plants (WWTPs) and Landfills across Canada. Scientific Publications:
Gewurtz, S. B.; Guerra, P.; Kim, M. G.; Jones, F.; Challen Urbanic, J.; Teslic, S.; Smyth, S. A. Wastewater treatment lagoons: Local pathways of perfluoroalkyl acids and brominated flame retardants to the Arctic environment. Environ. Sci.

Last Updated: Feb. 7, 2023
Date Published: Feb. 2, 2022
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Waste water, Wastewater, Sludge, Biosolids, Raw influent, Primary effluent, Final effluent, Primary treatment, Secondary treatment
Federal

This dataset contains 2005 concentrations of total mercury (THg), gaseous elemental mercury (GEM), methylated mercury, dimethyl mercury (DMHg) in the water column of the Canadian Arctic. Mercury in the Arctic is an important environmental and human health issue. The reliance of Northern peoples on traditional foods, such as marine mammals, for subsistence means that they are particularly at risk from mercury exposure. Mercury concentrations on biological organisms have increased since the onset of the industrial age and are controlled by a combination of abiotic factors, food web dynamics and structure, as well as animal behavior.

Last Updated: Jul. 29, 2021
Date Published: Aug. 28, 2018
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Arctic, Northwest Passage, North Open Polynya, Hudson Strait, Hudson Bay, Mercury, Northern Contaminants Program (NCP), Contaminants, Marine Food Web
Federal

This dataset contains the ambient dissolved concentrations of organophosphate esters (OPEs) and polybrominated diphenyl ethers (PBDEs) in North Atlantic Ocean (Greenland Sea) as well as a summary of the passive polyethylene samplers (PEs) deployed. Organophosphate esters (OPEs) have been found in remote environments at unexpectedly high concentrations, but very few measurements of OPE concentrations in seawater are available, and non are available in subsurface seawater. Passive polyethylene samplers (PEs) deployed on deep-water moorings in the Fram Strait and in surface waters of Canadian Arctic lakes and coastal sites were analyzed for a suite of common OPEs. Organophosphate esters are poorly understood contaminants in remote marine environments.

Last Updated: Jul. 23, 2021
Date Published: Oct. 19, 2018
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Oceans, Environment, Biota, Nature and Biodiversity - Contaminants
Federal

Concentrations of alternative flame retardants and polybrominated diphenyl ethers (PBDEs) were analyzed in ringed seal (Phoca hispida) blubber collected across the Canadian Arctic during subsistence hunts between 1998 and 2013. The presence of flame retardants in ringed seals suggests their persistence and their continuous inputs in the Canadian Arctic environment. Monitoring and research on the effects of these contaminants in seals are warranted given the importance of this species in Arctic marine food webs and for local communities. Supplemental Information

The Northern Contaminants Program (NCP, http://www.science.gc.ca/eic/site/063.nsf/eng/h_7A463DBA.html) was established in 1991 in response to concerns about human exposure to elevated levels of contaminants in wildlife species that are important to the traditional diets of northern Aboriginal peoples.

Last Updated: Jul. 22, 2021
Date Published: May 22, 2018
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Nature and Biodiversity - Contaminants, Arctic
Federal

We set out to examine possible links between climate warming and increases in mercury concentrations ([Hg]) in landlocked Arctic char (S. alpinus) in the High Arctic. Mercury concentrations vary regionally and have remained constant or increased slightly in landlocked char in lakes on Ellesmere Island and Cornwallis Island over a 12-16 year period. This, despite declining industrial mercury emissions in North America. Therefore, we hypothesized that climate warming might increase the input of mercury from catchments through permafrost melt, leading to greater associated body burden of adult char.

Last Updated: Jul. 22, 2021
Date Published: Apr. 28, 2014
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Northern Contaminants Program (NCP), Arctic Char, Fishes, Mercury, Contaminants, Char Lake, Cornwallis Island, Ellesmere Island, Kent Peninsula
Federal

Recent and historical deposition of mercury (Hg) are examined over a broad geographic area from southwestern Northwest Territories to Labrador and from the U.S. Northeast to northern Ellesmere Island using dated sediment cores from 50 lakes (18 in midlatitudes (41-50 degrees North), 14 subarctic (51-64 degrees North) and 18 in the Arctic (65-83 degrees North)). Objectives were to quantify latitudinal and longitudinal trends of anthropogenic mercury deposition in eastern and northern North America, to investigate variations in mercury deposition, to examine relationships with lake area, catchment/lake area ratio and sedimentation rates, and to compare results with model predictions. Distinct increases of mercury over time were observed in 76% of Arctic, 86% of subarctic and 100% of midlatitude cores. Subsurface maxima in mercury depositional fluxes were observed in only 28% of midlatitude lakes and 18% of arctic lakes, indicating little recent reduction of inputs.

Last Updated: Feb. 21, 2022
Date Published: Apr. 30, 2018
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Northern Contaminants Program (NCP), Mercury, Contaminants, Sediment cores, Northern Ecosystem Initiative (NEI), Toxic Substances Research Initiative (TSRI), Arctic lakes, Subarctic lakes, Mid-latitude lakes
Federal

Ringed seals (Phoca hispida) have been used as bioindicator species of environmental contamination in Canada since the 1970s. In the present study, seals were harvested during subsistence hunts in four regions of the Canadian Arctic: Beaufort Sea, Arctic Archipelago, Hudson Bay, and coastal Labrador. An extensive suite of persistent organic pollutants (POPs) was determined in seal blubber collected for multiple years between 1972 and 2016. Results from this long-term study indicate geographical differences in the contaminant concentrations in seals and the significant general decrease of most POPs, including polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and related compounds, chlordanes (CHL), and hexachlorocyclohexanes (HCH) over time in ringed seals.

Last Updated: Jul. 29, 2021
Date Published: Jun. 4, 2019
Organization: Environment and Climate Change Canada
Formats: CSV HTML
Keywords:  Northwest Territory, Inuvialuit, Nunavut, Nunavik, Nunatsiavut, Labrador, Canadian High Arctic, Northern Contaminants Program (NCP), community-based monitoring
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