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VIABLE BACTERIAL AEROSOL PARTICLE SIZE DISTRIBUTIONS IN THE MIDSUMMER ATMOSPHERE AT AN ISOLATED LOCATION IN THE HIGH DESERT CHAPARRAL
Citation:
Lighthart, B. AND B. Shaffer. VIABLE BACTERIAL AEROSOL PARTICLE SIZE DISTRIBUTIONS IN THE MIDSUMMER ATMOSPHERE AT AN ISOLATED LOCATION IN THE HIGH DESERT CHAPARRAL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/396.
Description:
The viable bacterial particle size distribution in the atmosphere at the Hanford Nuclear Reservation, Richland, WA during two 1-week periods in June 1992, was observed at three intervals during the day (morning, midday and evening) and at three heights (2, 4, and 8 m) above ground level. he distributions were significantly different (P = 0.01) between the two, 1-week sampling periods and between morning, midday, and evening observations, but not between the three heights. pproximately 30 to 50% fell into the largest particle size category; > 7.0 um aerodynamic diameter. ll particle size categories were at their minimum bacterial concentration at around noon, with the lowest concentrations in the smaller size categories (<2.1 lim aerodynamic diameter). his suggests, that at this high desert location, solar radiation (SR) damage to airborne bacteria is particle size discriminatory. here is a relatively greater effect on the smaller size categories at midday and relatively lesser effect in the morning and evening.