SYMPOSIA PAPER Published: 01 January 1982
STP33985S

Sampling and Analysis of Airborne Fenitrothion and Tris(2-Ethylhexyl)Phosphate

Source

An analytical technique is described for simultaneous determination of fenitrothion and tris(2-ethylhexyl)phosphate (TEHP) in air. Total airborne (vapor and aerosol) fenitrothion and TEHP were collected in glass tubes 75 by 6.3 mm outside diameter containing a 10-mm plug of Tenax GC. Air was drawn through the adsorber at a rate of about 1 L/min for a period of up to 4 h to measure the dosage of fenitrothion and TEHP or for 2 to 3 min to determine timewise variations of concentration. The break-through volume of the adsorbers was larger than 360 L at a sampling rate of 1 L/min. The material collected on Tenax GC was thermally released directly into a gas chromatographic column and analyzed using a thermionic detector. Cascade impactors were used to collect aerosol and measure the drop-size distribution over a range of 1 to 30 μm. The concentrations of fenitrothion and TEHP measured in field experiments varied over a range of 3 × 10−12 g/L to 2 × 10−8 g/L and 5 × 10−12 g/L to 2 × 10−10 g/L, respectively. The precision of the method was better than ± 10 percent using different adsorbers and ± 5 percent for the same adsorber. Field tests were conducted in New Brunswick forests during the 1980 spruce budworm control program.

Author Information

Krzymien, ME
Unsteady Aerodynamics Laboratory, National Aeronautical Establishment, National Research Council of Canada, Ottawa, Ont., Canada
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Details
Developed by Committee: D22
Pages: 35–46
DOI: 10.1520/STP33985S
ISBN-EB: 978-0-8031-4848-2
ISBN-13: 978-0-8031-0603-1