نتایج جستجو برای: air sampling
تعداد نتایج: 412201 فیلتر نتایج به سال:
. The drift of MCPA downwind of an aerial application was measured using short air sampling intervals in an attempt to estimate “real-time” concentrations. Prior drift studies examined deposition patterns or measured air concentrations downwind of pesticide applications using long sampling intervals (1 to 24 hours). This preliminary study was designed to determine: 1) the Eeasibility of “real-t...
Solanesol, a 45-carbon, trisesquiterpenoid alcohol found in tobacco leaves and tobacco smoke, has been used as a quantitative marker for tobacco smoke for years. However, solanesol appears to be unreliable as a quantitative marker for tobacco smoke during environmental air sampling because it can be degraded substantially when present as a component of tobacco smoke and by as much as 100% when ...
Individual PAH are shown to undergo chemical transformation when exposed to gases such as NO2, O3 and SO3. The possibility of artifact formation during sampling in stacks and in ambient air is discussed. PAH on soot, formed in a smoke gas generator, and exposed to NO chi and SO chi in a thermostated oven were degraded as a result of the sampling technique. Addition of NO2 (1 ppm) or gaseous HNO...
Mould growth in buildings is a major health issue, but most investigations of the indoor air spora still employ culture-based methods. These are inadequate for assessing exposure, since culturable organisms comprise a small fraction of the total of potentially allergenic/toxigenic units in air. For epidemiological studies, measurement of airborne fungal biomass over extended periods may be more...
Ascension Island is a remote South Atlantic equatorial site, ideal for monitoring tropical background CH4. In September 2014 and July 2015, octocopters were used to collect air samples in Tedlar bags from different heights above and below the well-defined Trade Wind Inversion (TWI), sampling a maximum altitude of 2700m above mean sea level. Sampling captured both remote air in the marine bounda...
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