Abstract
A personal denuder made of porous-metal disc has been designed and tested. The entire casing and substrate support are made of Teflon, and the sampling flow rate is 2 L/min. The sampler consists of a two-stage cascade impactor (having cut-off aerodynamic diameters of 9.5 and 2.0 μm, respectively) to collect liquid particles and two porous-metal discs (diameter: 2.54 cm; pore size: 100 μm; thickness: 0.317 cm) to collect basic and acidic gases, respectively. The denuder was tested for gas collection efficiency and capacity at a gas concentration of two times the permissible exposure limit (PEL, promulgated by Taiwan Institute of Occupational Safety and Health (IOSH)), with relative humidity (RH) of 80 ± 5% and temperature of 30 ± 3°C. The test data indicate that the gas collection efficiency is high, and the capacity is sufficient for the acidic/basic gas sampling in the workplace. Using 5% (w/v, g/mL) sodium carbonate/1% (w/v) glycerol coating on the porous-metal disc, the collection efficiency is 91.2 ± 0.26% (average ± standard deviation), 95.08 ± 0.06% and 100 ± 0.04%, and the capacity is 4.47, 7.2, and 2.5 mg for HNO 3 , HCl and HF, respectively. The collection efficiency for NH 3 for the porous-metal disc with 4% (w/v) citric acid coating is 96.39 ± 0.13%, and the capacity is 33.6 mg.
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