4 results match your criteria: "Center for Atmospheric Research Experiments[Affiliation]"
Comparison of concentrations and stereoisomer ratios of mecoprop, dichlorprop and metolachlor in Ontario streams, 2006-2007 vs. 2003-2004.
Environ Pollut
May 2010
Center for Atmospheric Research Experiments, Environment Canada, 6248 Eighth Line, Egbert, L0L 1N0 ON, Canada.
Article Synopsis
- The study examined concentrations of herbicides mecospop, dichlorprop, and metolachlor in Ontario streams during 2006-2007 and compared them to data from 2003-2004.
- Median levels of dichlorprop and metolachlor remained stable, but mecoprop concentrations increased in the later study.
- The findings regarding enantiomer signatures suggest that higher concentration samples showed more active forms of mecoprop, while lower concentrations indicated a mix of degradation processes affecting metolachlor.
Chiral current-use herbicides in Ontario streams.
Environ Sci Technol
November 2008
Center for Atmospheric Research Experiments, Environment Canada, 6248 Eighth Line, Egbert L0L 1N0, Ontario, Canada.
Article Synopsis
- The study analyzed concentrations of mecoprop, dichlorprop, and metolachlor in 393 Ontario stream samples from 2003-2004, finding peak levels significantly higher in 2004 compared to 2003.
- Mecoprop levels were consistent across agricultural and urban watersheds, while metolachlor concentrations were significantly greater in agricultural areas, suggesting distinct usage patterns of these herbicides.
- The analysis of enantiomer fractions revealed a predominance of the R(+) form of mecoprop during the transitional period of herbicide replacement, with significant variations in metolachlor's stereoisomer ratios depending on the concentration and watershed type.
Air-water gas exchange of toxaphene in Lake Superior.
Environ Toxicol Chem
June 2003
Center for Atmospheric Research Experiments, Meteorological Service of Canada, 6248 Eighth Line, Essa Township, R.R. 1, Egbert, Ontario L0L 1N0, Canada.
Parallel air and water samples were collected in Lake Superior during August 1996 and May 1997, to determine the levels and air-water exchange direction of toxaphene. Concentration of toxaphene in water did not vary across Lake Superior or between seasons (averaging 918 +/- 218 pg/L) but atmospheric levels were lower in May (12 +/- 4.6 pg/m3) than in August (28 +/- 10 pg/m3).
View Article and Find Full Text PDFSource-Receptor Modeling Using Trace Metals in Aerosols Collected at Three Rural Canadian Great Lakes Sampling Stations.
J Air Waste Manag Assoc
March 1998
b Center for Atmospheric Research Experiments (CARE), Atmospheric Environment Service , Ontario , Canada.
High-volume air samplers were used to collect aerosol samples on Whatman 41 air filters at the Canadian air sampling stations Burnt Island, Egbert, and Point Petre. The samples were analyzed for trace elements by neutron activation analysis. Air concentrations of over 30 trace elements were determined.
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