APPLICABILITY: The working range is 0.6 to 14 ppm (0.9 to 20 mg/m 3) for a 20-L air sample [1]. The method is applicable to
15-min samples taken at 1 L/min and 10-min samples taken at 1.5 L/min. The upper limit of loading depends on the
concentrations of hydrogen sulfide and other substances in the air, including water vapor. High relative humidity (80%) increases
the capacity of the sampler four-fold, relative to dry air. Some lots of charcoal have excessively high sulfur backgroun ds and/or
poor desorption efficiencies; therefore, screening of each lot should be done before field use.