• Article

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

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

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