Abstract
Pesticide drift studies were conducted in which two formulations were sprayed simultaneously to eliminate meteorological differences. One formulation was traced with Brilliant Sulfo Flavine (BSF) dye and the other with Rhodamine B (RhB) dye. Combined drift from both formulations was caught downwind on Mylar sheets. A filter fluorometer was used to analyze the deposits. By proper selection of a light source, primary filters, and secondary filters, the BSF was excluded while the RhB was analyzed, and vice versa. Concentrations below 1.0 μg/L were accurately measured.
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