Collection and determination of trace quantities of pesticides in air

Abstract

gaseous impurities which do not affect the dew point of air but retard the dissolution rate and solubility of the hygroscopic materials in water existed in the atmosphere, the existing clouds and fogs should tend to disappear.Sodium chloride particles were recently used in tests to clear fog from airports. Relatively good results were reported for these tests in the 1969 Spring issue of

Measurement of atmospheric levels of pesticides

“…These results and those in Table V support the studies of Miles et al (1970), but also show that the activated alumina trap must be added to increase the collection efficiency.…”

“…An air sampling unit was designed at Midwest Research Institute for the collection of air samples based on the tech- (Miles et al, 1970). An absorption tube containing activated alumina was added to trap pesticides that might pass through the scrubber (Hornstein and Sullivan, 1953).…”

Occurrence of trifluralin and its photoproducts in air

“…Air Sampling Techniques. Air sampling techniques for pesticides usually consist of drawing air through a solvent-filled bubbler or impinger (Miles et al, 1970). Drawbacks to this method include a restricted sampling rate (0.03 m3/min) which necessitates long sampling periods, and expensive and fragile glassware often inconvenient for portable use.…”

Measurement of residues of dichlorvos absorbed by food exposed during disinsection of aircraft

“…Immediately following the placement of the samples on the rack in the wind tunnel, the fan and dichlorvos dispensing system were started. The concentration of dichlorvos in the air was determined by the method described by Miles et al (1970). The air samplers were placed adjacent to the exposure rack and air was sampled at the rate of 9.5 l./min.…”