High-volume air sampler for particle and gas sampling. 1. Design and gas sampling performance
A high-volume air sampler was developed to collect organic compounds in the gas and particulate phases at flows up to 1.4 m 3 /min. Quartz fiber or Teflon membrane filters can be employed; use of a backup filter allows correction for the direct adsorption of gaseous analytes to the filter. Most of the filtered air passes through two 1.27 cm thick polyethane foam sheets (PUFSs) in series; the remainder passes through two Tenax cartridges in series. The thin, filter-size (20 cm×25 cm) PUFSs permit high-flow rates with minimal pressure drop