National Oceanic and
Atmospheric Administration
United States Department of Commerce


FY 1989

Collection efficiencies of a tandem sampling system for atmospheric aerosol particles and gaseous ammonia and sulfur dioxide

Quinn, P.K., and T.S. Bates

Environ. Sci. Technol., 23(6), 736–739, doi: 10.1021/es00064a013 (1989)

The collection efficiencies of aerosol particles and gaseous NH3 and SO2 were tested for a tandem sampling system consisting of a cyclone separator followed by a 1.0 µm pore size 47-mm Millipore Teflon particle filter and four 47-mm Whatman 41 filters coated with oxalic acid and either K2CO3 or LiOH. The collection efficiency of the cyclone was compared with an 8.0 µm pore size Nuclepore filter using NaCl particles. Both the cyclone and the filter had a 50% collection efficiency at 0.9 µm (50 standard L/min, 55 cm s−1 filter face velocity). Known amounts of NH3 and SO2 were generated and collected on the coated filters. The collection efficiency of the system for NH3 was found to be 103 ± 30%. The SO2 collection efficiency on K2CO3− and LiOH-coated filters was 100 ± 21 and 88 ± 9%, respectively, and was not affected by the presence of reduced sulfur gases or ozone in the sampled air stream.

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