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Vapor pressures of sulfonylurea herbicides
Author(s) -
Schmuckler Margaret E,
Barefoot Aldos C,
Kleier Daniel A,
Cobranchi Daryl P
Publication year - 2000
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/(sici)1526-4998(200006)56:6<521::aid-ps155>3.0.co;2-y
Subject(s) - knudsen number , vapor pressure , volatilisation , volatility (finance) , chemistry , sulfonylurea , saturation (graph theory) , water vapor , analytical chemistry (journal) , chromatography , thermodynamics , organic chemistry , medicine , physics , mathematics , combinatorics , insulin , financial economics , economics , endocrinology
Vapor pressure values for agricultural chemicals are necessary for estimating volatilization and dissipation through transport in the vapor phase. The low vapor pressures of the sulfonylurea herbicides have presented significant challenges in vapor pressure determination. We have used the Knudsen gas effusion method at elevated temperatures and extrapolated to 25 °C. Along with the Knudsen method, computer calculations using the Grain equation were also used to estimate vapor pressure. The gas saturation method with quantitation by high performance liquid chromatography (HPLC) provided an upper limit that confirmed the low vapor pressures obtained using Knudsen gas effusion and computer calculations. We report the best available experimental results for the vapor pressures of sulfonylurea herbicides. © 2000 Society of Chemical Industry