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Desorption of Herbicides from Atmospheric Particulates During High-Volume Air Sampling
Research Centre, Agriculture and Agri-Food Canada, 11 Innovation Blvd, Saskatoon, Saskatchewan S7N 3H5, Canada
Environment Canada, 2365 Albert St, Regina, Saskatchewan S4P 4K1, Canada
National Hydrology Research Centre, 11 Innovation Blvd, Saskatoon, Saskatchewan S7N 3H5 Canada
Research Station, Agriculture and Agri-Food Canada, 5000 Wascana Parkway, Regina, Saskatchewan S4P 3A2, Canada
Present address: Environment Canada, National Hydrology Research Centre, 11 Innovation Boulevard, Saskatoon, Saskatchewan, S7N 3H5, Canada.
* Author to whom correspondence should be addressed.
Received: 25 July 2011; in revised form: 20 October 2011 / Accepted: 24 October 2011 / Published: 14 November 2011
Abstract: Pesticides can be present in the atmosphere either as vapours and/or in association with suspended particles. High-volume air sampling, in which air is aspirated first through a glass fibre filter to capture pesticides associated with atmospheric particulates and then polyurethane foam (PUF), often in combination with an adsorbent resin such as XAD-2, to capture pesticides present as vapours, is generally employed during atmospheric monitoring for pesticides. However, the particulate fraction may be underestimated because some pesticides may be stripped or desorbed from captured particulates due to the pressure drop created by the high flow of air through the filter. This possibility was investigated with ten herbicide active ingredients commonly used on the Canadian prairies (dimethylamine salts of 2,4-D, MCPA and dicamba, 2,4-D 2-ethylhexyl ester, bromoxynil octanoate, diclofop methyl ester, fenoxaprop ethyl ester, trifluralin, triallate and ethalfluralin) and seven hydrolysis products (2,4-D, MCPA, dicamba, bromoxynil, diclofop, clopyralid and mecoprop). Finely ground heavy clay soil fortified with active ingredients/hydrolysis products was evenly distributed on the glass fibre filters of high-volume air samplers and air aspirated through the samplers at a flow rate of 12.5 m3/h for a 7-day period. The proportion desorbed as vapour from the fortified soil was determined by analysis of the PUF/XAD-2 resin composite cartridges. The extent of desorption from the fortified soil applied to the filters varied from 0% for each of the dimethylamine salts of 2,4-D, MCPA and dicamba to approximately 50% for trifluralin, triallate and ethalfluralin.
Keywords: herbicide active ingredient; hydrolysis product; particulate component; vapour component; high-volume air sampling; desorption; preemergence-applied; postemergence-applied
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Cessna, A.J.; Waite, D.T.; Bailey, J.; Kerr, L.A.; Quiring, D.V. Desorption of Herbicides from Atmospheric Particulates During High-Volume Air Sampling. Atmosphere 2011, 2, 671-687.
Cessna AJ, Waite DT, Bailey J, Kerr LA, Quiring DV. Desorption of Herbicides from Atmospheric Particulates During High-Volume Air Sampling. Atmosphere. 2011; 2(4):671-687.
Cessna, Allan J.; Waite, Don T.; Bailey, Jonathan; Kerr, Lorne A.; Quiring, Dwight V. 2011. "Desorption of Herbicides from Atmospheric Particulates During High-Volume Air Sampling." Atmosphere 2, no. 4: 671-687.