Performance Evaluation of a Portable Nanoparticle Sizer under Various Relative Humidity Environments
Nanoparticles (i.e., ultrafine particles, UFPs) are ubiquitous in the ambient. The primary sources for UFPs are traffic-related (i.e., particulate emission from automobile engines). More recent studies show that UFPs may be particularly relevant to pulmonary and cardiovascular diseases, cancer and mortality, as indicated by studies on both acute and long term effects Epidemiological studies have also evidenced that increased asthma prevalence, including the number of patients diagnosed with the disease as well as asthma-related hospital visits is closely associated with UFP PM levels in the ambient air, the regional motor vehicle traffic density and residential proximity to freeways. As the increased concern of adverse health effect of nanoparticles, a cost-effective portable particle sizer based on the particle electrical mobility technique has been developed to meet the demand of personal monitoring or spatial distribution measurement of nanoparticles. The sizer consists of three key components: a miniature unipolar charger to electrically charge sampled particles, a miniaturized disk-type electrostatic aerosol precipitator to alter charged particle distributions and a TSI P-Trak to measure the concentration of particles exited from the precipitator. In this study we first evaluated the performance of the above sizer in the laboratory setting using the particles produced by various aerosol generation techniques. A humidity chamber had further been constructed for conditioning test aerosol stream at various relative humidity and temperature. The performance of the portable sizer was then evaluated by comparing the measured particle size distribution with that characterized by a Scanning Mobility Particle Sizer (TSI SMPS). The detail results of this study will be discussed in this presentation.
Portable nanoparticle sizer Personal aerosol exposure Relative humidity
Siqin He Da-Ren Chen
Department of Energy,Environmental and Chemical Engineering,Washington University in St. Louis,Campus Box 1180,One Brookings Drive,St. Louis,MO 63130,USA
国际会议
西安
英文
155-160
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）