Using preweighed Teflon filters (37 mm, μm pore size; Pall), the mass concentration of CAPs was determined daily; the particle concentration from filtered air (FA) was determined on a weekly basis. Particle-laden filters were equilibrated overnight in a temperature/humidity-controlled weigh room (21°C±°C and 40±5% relative humidity) and were weighed gravimetrically on an MT5 microbalance (Mettler Toledo). Filters from every third exposure day, as well as lot-matched unexposed blank control filters, were analyzed by X-ray fluorescence spectroscopy (XRF) to determine elemental content using an ARL™ Quant’X EDXRF Analyzer (ThermoScientific).
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