✦ LIBER ✦

Vapor pressures of sulfonylurea herbicides

✍ Scribed by Margaret E Schmuckler; Aldos C Barefoot; Daniel A Kleier; Daryl P Cobranchi

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 177 KB
Volume: 56
Category: Article
ISSN: 1526-498X
DOI: 10.1002/(sici)1526-4998(200006)56:6<521::aid-ps155>3.0.co;2-y

No coin nor oath required. For personal study only.

✦ Synopsis

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 signi®cant 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 con®rmed 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.

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