A Method to Improve the Adhesion of Aerosol Particles on Teflon Filters

Measurement Methods to Determine Compliance with Ambient Air Quality Standards for Suspended Particles

“…475 Two issues are often confused when discussing filter contamination: gas adsorption (positive artifact) and particle volatilization (negative artifact). Adsorbed gases result from adherence of gases to the filter medium and result in positive biases to mass and chemical concentration.…”

Mass and Elemental Composition of Fine and Coarse Particles in Six U.S. Cities

“…Since the collection and analysis of the samples considered in this paper, one apparent bias in the coarse filter mass and elemental concentrations has been documented: the loss of coarse particles from filters during transit from the field to the EPA in North Carolina. A recent paper by Dzubay and Barbour 20 has revealed that dropping packaged teflon filter trays (five times from a height of 2.3 m) results in coarse particle mass losses of 19-53% of mass, but no measurable losses from fine filter masses. In our in-house analysis of hand-carried coarse and fine samples, preliminary results confirm an average loss of 30-35% in coarse samples in the mail, but no measurable difference in fine filter masses.…”

The Estimation of Personal Exposures to Air Pollutants for a Community-Based Study of Health Effects in Asthmatics—Design and Results of Air Monitoring

“…An additional 26 12-hour dichotomous samples were invalidated due to excessively long or short sampling intervals. The observation of unusual patterns of concentration variation with time, and uncertainties with regard to possible loss of mass during handling and shipment 15 resulted in all coarse dichotomous samples being deemed unusable in this study.…”