Kristina N. Graham, G. R. Barrie Webster and Leonard P. Sarna. 1996. Evaluation of analytical methodologies for diesel fuel derived contaminants in soil: variability and significance of results. ECOTOX Workshop, Winnipeg, MB, June 16-19, Poster #21.
David C. Hay, G. R. Barrie Webster and Leonard P. Sarna. 1996. Availability-related Analysis of Chlorophenols and Acid Herbicides in Soils and Water by SPME. ECOTOX Workshop, Winnipeg, MB, June 16-19, Poster #23.
A.-M. Tugulea, L. P. Sarna and G. R. B. Webster. 1996. Direct SPME-based Method for the Extraction of the Herbicide Atrazine from Soil Slurries. 7th Annual Mid-Canada AOAC Mtg., Winnipeg, MB, June 13.
D. C. Hay, G. R. B. Webster and L. P. Sarna. 1996. Innovative Techniques for the Analysis of Chlorophenols and Acid Herbicides in Soils and Water. 7th Annual Mid-Canada AOAC Mtg., Winnipeg, MB, June 13.
K. N. Graham, G. R. B. Webster and L. P. Sarna. 1996. Diesel Fuel Derived Contaminants in Soil. 7th Annual Mid-Canada AOAC Mtg., Winnipeg, MB, June 13.
A.-M. Tugulea, L. P. Sarna and G. R. B. Webster. 1996. Direct SPME-based Method for the Extraction of the Herbicide Atrazine from Soil Slurries. EnviroAnalysis '96, Ottawa, ON, May 13-16, Poster #6.
D. C. Hay, G. R. B. Webster and L. P. Sarna. 1996. Innovative Techniques for the Analysis of Chlorophenols and Acid Herbicides in Soils and Water. EnviroAnalysis '96, Ottawa, ON, May 13-16, Poster #7.
K. N. Graham, G. R. B. Webster and L. P. Sarna. 1996. Preliminary Evaluation of Analytical Methodologies for Diesel Fuel Derived Contaminants in Soil. EnviroAnalysis '96, Ottawa, ON, May 13-16, Poster #8.
K. N. Graham, G. R. B. Webster and L. P. Sarna. 1996. Preliminary Evaluation of Analytical Methodologies for Diesel Fuel Derived Contaminants in Soil. Proc. 39th Ann. Man. Soil Sci. Mtg., Winnipeg, MB, January 3-4.
D. C. Hay, G. R. B. Webster and L. P. Sarna. 1996. Innovative Techniques for the Analysis of Chlorophenols and Acid Herbicides in Soils and Water. Proc. 39th Ann. Man. Soil Sci. Mtg., Winnipeg, MB, January 3-4.
A.-M. Tugulea, L. P. Sarna and G. R. B. Webster. 1996. Use of a New SPME-Based Method in the Study of the Soil Sorption of the Nerbicide Atrazine. Proc. 39th Ann. Man. Soil Sci. Mtg., Winnipeg, MB, January 3-4.
G. R. B. Webster, L. P. Sarna, D. A. Thomas, E. A. Braekevelt, G. Tomy, S. Tillemier, K. G. Drouillard, T. Hiebert, K. J. Friesen, A. Fisk and G. A. Stern. 1995. SPME-GC-EC of Chlorinated Paraffins in Water. Second SETAC World Congress, Vancouver, B. C., Canada, November 5- 9.
Anca-Maria Tugelea, Kristina N. Graham, Leonard P. Sarna and G. R. Barrie Webster. 1995. Solid Phase Microextraction (SPME)-GC for the Determination of Herbicide Residues in Run-Off Water and Soil Slurries. Mid-Canada A.O.A.C. Meeting, Winnipeg, MB, June 15.
G. R. B. Webster, K. N. Graham, L. P. Sarna, H. Y. F. Ng, D. A. Cancilla, J. D. Gaynor, C. S. Tan, C. F. Drury and T. Welacky. 1995. Comparison of SPME-GC-EC with Solid Phase Extraction-GC-MS and Immunoassay for Metolachlor Residues in Agricultural Runoff Water. 78th Canadian Society for Chemistry Conference, Guelph, ON, May 28 - June 1.
G. R. B. Webster, K. N. Graham, L. P. Sarna, H. Y. F. Ng and J. D. Gaynor. 1995. SPME-GC-EC Compared with More Conventional Methods for Metolachlor Residues in Agricultural Runoff and Tile Drainage Water. 27th Eastern Canadian Pesticide Residue and Environmental Contaminants Workshop, Sault Ste. Marie, ON, May 25-27.
G. R. B. Webster, K. N. Graham, L. P. Sarna, J. D. Gaynor and H. Y. F. Ng. 1995. Solid Phase Microextraction (SPME) of the Herbicide Metolachlor in Runoff Water Samples. 7th Symposium on Handling of Environmental and Biological Samples in Chromatography , Lund, Sweden, May 8-10.
K. L. Anderson, L. P. Sarna and G. R. B. Webster. 1995. Analysis of Lindane in Water and Soil by Solid Phase Microextraction. Proc. 38th Ann. Man. Soil Sci. Mtg., Winnipeg, MB, January 3-4.
K. N. Graham, G. R. B. Webster and L. P. Sarna. 1995. Solid Phase Microextraction-Gas Chromatography for Analysis of Diesel Residues in Soil. Proc. 38th Ann. Man. Soil Sci. Mtg., Winnipeg, MB, January 3-4.
G. R. B. Webster, L. P. Sarna, K. L. Anderson and K. N. Graham. 1994. Application of Solid Phase Microextraction to the Analysis of Chlorinated Contaminants in Environmental Matrices. 15th Annual Meeting of SETAC, Denver, CO, U. S. A., October 30-November 3.
G. R. B. Webster, L. P. Sarna, K. N. Graham, K. A. Anderson and Anca-Maria Tugulea. 1994. Solventless Residue Analysis of Pesticides and Other Contaminants in Water and Soil. Inorganic Photochemistry and Environmental Speciation: Symposium at the University of Calgary, Calgary, AB, October 29.
L. P. Sarna, K. N. Graham and G. R. B. Webster. 1994. Innovative Analytical Method for Organic Contaminant Residues in Soil and Water. Canadian Society for Chemistry, 1994 Conference, Environment Division, Winnipeg, Manitoba, May 29-June 2.
K. N. Graham, L. P. Sarna and G. R. B. Webster. 1994. Solid Phase Microanalysis/Gas Chromatographic Analysis of Hydrocarbon Fuel Residues in Soil and Water. 24th Intern. Symposium on Environmental Analytical Chemistry, Ottawa, Ontario, May 16-19.
G. R. B. Webster, L. P. Sarna and K. N. Graham. 1994. Innovative Analysis of the Pesticides Metolachlor, Atrazine and Diclofop-methyl in Water by SPME. 29th Annual Pesticide and Trace Analysis Seminar for Western Canada, Vancouver, B.C., May 3-5.
G. R. B. Webster, L. P. Sarna, P. Wolfe and D. S. Gamble. 1993. Separating the Biotic from the Abiotic in the Interaction of the Herbicide Propanil with Two Manitoba Soils. 3rd Soil and Sediment Contaminant Analysis Workshop of the International Association of Environmental Analytical Chemistry, Winnipeg, Manitoba, August 8-11, 1993.
H. Jin, G. R. B. Webster and L. P. Sarna. 1993. Supercritical Fluid Extraction versus Liquid Extraction of Chlorpyrifos and Its Major Metabolites from Soil. 3rd Soil and Sediment Contaminant Analysis Workshop of the International Association of Environmental Analytical Chemistry, Winnipeg, Manitoba, August 8-11, 1993.
Heng Jin, L.P. Sarna and G.R.Barrie Webster. 1993. Optimization of Supercritical Fluid Extraction vs Ball Mill Extraction of Chlorpyrifos and Metabolites from Soil. Proc. 28th Ann. Pesticide Analysts' Workshop, W. Canada, and 21th Ann. Meeting Chem. Biochem. Herbicides, Winnipeg, Manitoba, April 26-29, 1993.
H. Jin, G.R. Barrie Webster and Leonard P. Sarna. 1992. GC Analysis of Chlorpyrifos and Major Metabolites in Elm Bark, Litter, and Soil. Proc. 27th Ann. Pesticide Analysts' Workshop, W. Canada, Saskatoon, Sask., April 30-May 1.
G.R.B. Webster, W.D. Buchannon, L.P. Sarna, D.F. Kenny and J.B. Westmore. 1991. An Apparent Anomaly in the Mass Spectrometry of Bromoxynil Octanoate. 19th Ann. Meeting Chem. Biochem. Herbicides, Edmonton, Alta., April 29-30.
B.F. Rordorf, L.P. Sarna, G.R.B. Webster, S.H. Safe, L.M. Safe, D. Lenoir, K.H. Schwind and O. Hutzinger. 1989. Vapor Pressure Measurements on Halogenated Dibenzo-p-Dioxins and Dibenzofurans. An Extended Data Set for a Correlation Method. 9th Intern. Symposium on Chlorinated Dioxins and Related Compounds , Toronto, Canada, September 17-22.
K.J. Friesen, J. Vilk, L.P. Sarna, G.R.B. Webster and D.C.G. Muir. 1989. Aqueous Solubilities of Chlorinated Dibenzofurans. Temperature Dependence and Structure Correlation. 9th Intern. Symposium on Chlorinated Dioxins and Related Compounds, Toronto, Canada, September 17-22.
B.F. Rordorf, L.P. Sarna, G.R.B. Webster, S.H. Safe, L.M. Safe, D. Lenoir and O. Hutzinger. 1989. Thermal Properties of Environmental Contaminants: Vapor Pressure Measurements on Halogenated Dibenzo-p-Dioxins and Dibenzofurans. Symposium on Chemical Themodynamics, Calorimetry and Thermal Analysis - 1989, Basle, Switzerland, September 10-14.
G.R.B. Webster, M.H. Abdel-Kader and L.P. Sarna. 1987. Distribution and Fate of Malathion and Fenitrothion in Milled Fractions of Wheat Stored at Low Temperatures. 2nd Workshop on Chemistry and Fate of Organophosphorous Compounds, Barcelona, Spain, November 10-12.
G.R.B. Webster, L.P. Sarna, K.J. Friesen and D.C.G. Muir. 1987. Analysis of Chlorinated Dioxin Residues in Soil and Sediment. Assoc. Offic. Anal. Chem. Spring Training Workshop, Ottawa, ON., April 27-30.
G.R.B. Webster, L.P. Sarna, G.G. Choudhry, M.R. Servos and D.C.G. Muir. 1987. Methods of Dissolving Hydrophobics for Studies of Aqueous Solution Interactions with Dissolved Organic Matter. 193rd National Meeting, American Chemical Society, Division of Environmental Chemistry, Denver, CO, U.S.A., April 5-10.
G.R.B. Webster, D.H. Muldrew, N.J. Graham, L.P. Sarna and D.C.G. Muir. 1985. Dissolved Organic Matter Mediated Aquatic Transport of Chlorinated Dioxins. 5th Intern. Symposium on Chlorinated Dioxins and Related Compounds, Bayreuth, FRG, September 16-19.
B.F. Rordorf, L.P. Sarna and G.R.B. Webster. 1985. Vapor Pressure Determination of Several Polychlorodioxins by Two Gas Saturation Methods. 5th Intern. Symposium on Chlorinated Dioxins and Related Compounds, Bayreuth, FRG, September 16-19.
K.J. Friesen, L.P. Sarna and G.R.B. Webster. 1985. Determination of Physical Constants of Hydrophobic Chemicals for Purposes of Environmental fate Modeling. Proc. 13th Ann. Workshop Mtg. Chem. Biochem. Herbicides, Winnipeg, MB, May 8-9.
T.C. Kuchnicki, L.P. Sarna and G.R.B. Webster. 1985. The Measurement of Nitrate and Nitrite in Soils by Reverse Phase HPLC. Proc. 28th Ann. Manitoba Soil Sci. Mtg., Winnipeg, MB, January 9-10, pp.124-134.
G.R.B. Webster, K.J. Friesen, L.P. Sarna and D.C.G. Muir. 1984. Environmental Fate Modeling of Chlorinates Dioxins: Determination of Physical Constants by Chromatographic Techniques. 4th Intern. Symposium on Dioxins and Related Compounds, Ottawa, ON, October 16-18.
G.R.B. Webster, K.J. Friesen, L.P. Sarna, D.H. Muldrew, P.E. Hodge, D.C.G. Muir and K.W. Marshall. 1984. Chlorinated Dioxins: Environmental Parameters by Chromatographic Techniques. 1984 Intern. Chemical Congress of Pacific Basin Societies , Honolulu, Hawaii, U.S.A., December 16-21.
L.P. Sarna, P.E. Hodge and G.R.B. Webster. 1984. Comparison of Several C-18 Columns for Octanol-Water Partition Coefficients for Chlorinated Dioxins. Proc. 19th Ann. Pesticide Analysts' Workshop, W. Canada, Saskatoon, Sask., April 25-27.
K.J. Friesen, L.P. Sarna, P.E. Hodge, G.R.B. Webster and D.C.G. Muir. 1984. Determination of Water Solubility and Octanol-Water Partition Coefficients of Chlorinated Dioxins. Proc. 19th Ann. Pesticide Analysts' Workshop, W. Canada, Saskatoon, Sask., April 25-27.
G.R.B. Webster, L.P. Sarna and D.C.G. Muir. 1983. Kow of 1,3,6,8-T4CDD and O8CDD by Reverse Phase HPLC. 186th Mtg. Amer. Chem. Soc., Environ. Chem. Div., Washington, DC, August 28 - September 2.
L.P. Sarna, G.P. Rawn and G.R.B. Webster. 1982. GLC and HPLC Analysis of the 3,5,6-Trichloro-2-pyridinol Metabolite of Chlorpyrifos by Derivatization with Ethyl Chloroformate. Proc. 17th Ann. Pesticide Analysts' Workshop, W. Canada, Vancouver, BC, April 27-29.
B.P. Krawchuk, L.P. Sarna and G.R.B. Webster. 1982. Analysis of Irrigation Tile Drainage Water for Herbicide Residues. Proc. 10th Ann. Mtg. Chem. Biochem. Herbicides, Regina, SK., April 5-6.
L.P. Sarna, G.P. Rawn and G.R.B. Webster. 1981. Analysis of Dursban (Chlorpyrifos) in Pond Water by HPLC. Proc. 16th Ann. Pesticide Analysts' Workshop, W. Canada, Winnipeg, MB, April 28-30.
G.R.B. Webster, B.L. Worobey and L.P. Sarna. 1978. Analysis of MCPA and 2,6-Difluorobenzoic Acid in Water as Their Pentafluorobenzyl Derivatives. Proc. 6th Ann. Mtg. Chem. Biochem. Herbicides , Regina, Sask., April 10-11.
L.P. Sarna and G.R.B. Webster. 1977. GLC Analysis of Methoprene and Primary Metabolites in Pond Water. Proc. 12th Ann. Pesticide Analysts' Workshop, W. Canada, Winnipeg, MB, May 10-12.
L.P. Sarna and G.R.B. Webster. 1976. Analysis of the Juvenile Hormone Analogue Altosid in Water. Proc. 11th Ann. Pesticide Analysts' Workshop, W. Canada, Saskatoon, Sask., May 10-12.
L.P. Sarna, G.R.B. Webster, G. Howe and G.M. Findlay. 1975. Simultaneous Gas Chromatographic Analysis of Dimethoate and Several Metabolites by Derivatization. Proc. 10th Ann. Pesticide Analysts' Workshop, W. Canada, Edmonton, Alta., May 12-14.
L.P. Sarna and G.R.B. Webster. 1974. The Coulson Conductivity Detector for Nitrogen Compounds. A Maintenance Program Enabling GLC Analysis of Herbicides in Crude Soil Extracts. Proc. 9th Ann. Pesticide Analysts' Workshop, W. Canada, Vancouver, BC, May 29-30.
G.R.B. Webster, L.P. Sarna and S.R. Macdonald. 1973.
Nonbiological Degradation of Sencor in Manitoba Soils. Proc.
Agric. Pesticide Soc. Mtg., A.I.C. Convention, Victoria, BC,
August 20-23.
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