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. Author manuscript; available in PMC: 2024 Oct 1.
Published in final edited form as: Environ Pollut. 2023 Jul 11;334:122183. doi: 10.1016/j.envpol.2023.122183

Figure 1:

Figure 1:

A) Schematic view of the Two-Stage Combustion Reactor (TSCR) used to generate environmentally persistent free radicals (EPFRs) with controlled radical concentrations. The injection port temperatures were at (A) 400°C at 1 cm, (B) 700°C at 2 cm and (C) 940°C at 3 cm from the outside wall of the furnace and 975°C in the center of zone 2. B) Whole-body exposure set up showing the direction of air and particle flow into and out of the chamber. HEPA-filtered air was directed through the Venturi where the particles were aerosolized prior to being delivered into the 18 L plexiglass chamber. Aerosolized EPFRs were collected from the chamber for DustTrak, gravimetric measurements, transmission electron microscopy (TEM), and scanning mobility particle sizer (SMPS) during exposure. C) Tabular values of the average EPFRs exposure conditions inside the exposure chamber for 4 hours per day for 5 consecutive days.