Determination of air movement in stored grain as a factor in dynamic dispersion and distribution patterns of gaseous pesticides (fumigants).
The new research reported herein was motivated by variations in distribution-persistence patterns of fumigant residues (BERCK, 1974). The current developmental program is still underway. In the meantime, measurement of picoliter amounts of SF6 in air by GC equipped with a Ni63 EC detector has been proven useful over an airflow range of 10(-4) to 50 mph, representing a factor of 500,000 in differences in air velocity. Diverse applications have been outlined herein. This is the first case on record where measurement of unassisted airflow in the interstitial air of stored grain has been successfully executed, and which enabled determination of airflow speeds in the range of 0.5 to 7.5  times 10(-4) mph (=3 to 45 inches per hour).
D000392:Air Movements; D002523:Edible Grain; D005459:Fluorides; D005651:Fumigation; D010575:Pesticides; D013455:Sulfur; D013997:Time Factors; D014908:Triticum
D010575:Pesticides; D013455:Sulfur; D005459:Fluorides