• Journal Article

Revisiting the size selective performance of EPA's high-volume total suspended particulate matter (Hi-Vol TSP) sampler

Citation

Krug, J. D., Dart, A., Witherspoon, C. L., Gilberry, J., Malloy, Q., Kaushik, S., & Vanderpool, R. W. (2017). Revisiting the size selective performance of EPA's high-volume total suspended particulate matter (Hi-Vol TSP) sampler. Aerosol Science and Technology, 51(7), 868-878. DOI: 10.1080/02786826.2017.1316358

Abstract

Under the National Ambient Air Quality Standard (NAAQS) for airborne lead, measurements are conducted by means of a high-volume total suspended particulate matter (Hi-Vol TSP) sampler. In the decade between 1973 and 1983, there were 12 publications that explored the sampling characteristics and effectiveness of the Hi-Vol TSP, yet there persists uncertainty regarding its performance. This article presents an overview of the existing literature on the performance of the Hi-Vol TSP, and identifies the reported sampler effectiveness with respect to four factors: particle size (reported effectiveness of 7%-100%), wind speed (-36% to 100%), sampler orientation (7%-100%), and operational state (107%-140%). Effectiveness of the Hi-Vol TSP was evaluated with a solid, polydisperse aerosol in a controlled wind tunnel setting. Isokinetic samplers were deployed alongside the Hi-Vol TSP to investigate three wind speeds (2, 8, and 24km h(-1)), three sampler orientations (0 degrees, 45 degrees, 90 degrees), and two operational states (on, off) for aerosols with aerodynamic diameters from 5 to 35 mu m. Results indicate that particle diameter was the largest determining factor of effectiveness followed by wind speed. Orientation of the sampler did not have a significant effect at 2 and 8km h(-1) but did at 24km h(-1). In a passive state, the Hi-Vol TSP was collected between 1% and 7% of available aerosol depending on particle size and wind speed. Results of this research do not invalidate results of previous studies but rather contribute to our overall understanding of the Hi-Vol TSP's size-selective performance. While results generally agreed with previous studies, the Hi-Vol TSP was found to exhibit less dependence on these four factors than previously reported.(c) 2017 American Association for Aerosol Research