Viable bacterial aerosol particle size distributions in the midsummer atmosphere at an isolated location in the high desert chaparral |
| |
Authors: | Bruce Lighthart Brenda T. Shaffer |
| |
Affiliation: | (1) U.S. Environmental Protection Agency, Environmental Research Laboratory, 97333 Corvallis, OR, USA;(2) ManTech Environmental Technology Inc., 200 SW 35th St., 97333 Corvallis, OR, USA |
| |
Abstract: | 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. The 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. Approximately 30 to 50% fell into the largest particle size category; 7.0µm aerodynamic diameter. All particle size categories were at their minimum bacterial concentration at around noon, with the lowest concentrations in the smaller size categories (<2.1µm aerodynamic diameter). This suggests, that at this high desert location, solar radiation (SR) damage to airborne bacteria is particle size discriminatory. There is a relatively greater effect on the smaller size categories at midday and a relatively lesser effect in the morning and evening. |
| |
Keywords: | Bacterial aerosol Particle size distribution Desert chaparral |
本文献已被 SpringerLink 等数据库收录! |
|