Use of a fluorescent pigment dye and a chemical tracer to quantify aerial spray deposits on collection surfaces
Titel:
Use of a fluorescent pigment dye and a chemical tracer to quantify aerial spray deposits on collection surfaces
Auteur:
Sundaram, A. Sundaram, K. M. S.
Verschenen in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paginering:
Jaargang 27 (1992) nr. 2 pagina's 165-184
Jaar:
1992-04
Inhoud:
Aerial spray deposits were measured on collection surfaces using two methods: spectrophotometry for Day-Glo®, a fluorescent dye tracer; and gas-liquid chromatography (GLC) for triethyl phosphate (TEP), a chemical tracer. The spray mix consisted of glycerol, water, Atlox® 3409F and the two tracers. It was sprayed on May 4, 1988 at 5 L/ha over an 8-ha flat area of the Sault Ste. Marie airport, using a Cessna 188 aircraft equipped with rotary atomizers. Balsam fir-shaped aluminum branch tips, natural fir needles and glass plates were used to collect deposits. The Day-Glo dye deposits on the samplers were quantified in the ultra-violet region at a of 234 nm. The minimum detection limit (HDL) and minimum quantification limit (MQL) were 1.0 and 2.0 μg/mL respectively. The GLC quantification of the TEP deposits was more sensitive, and provided HDL and HQL values of 0.005 and 0.010 μq/mL respectively. The average deposits on all the three surfaces tested were slightly higher when measured by spectrophotometry, compared to those measured by the GLC method.
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