(kPa or other pressure units)
Ps = pressure of air sampled (same units as Pc)
Tc = temperature during calibration of sampling pump (EK)
Ts = temperature of air sampled (EK).
b. Sampling Instructions for Solid Sorbent Tube Sampler
Use these instructions for active personal sampling (i.e., pumped sample airflow) for substances which are retained on solid sorbents such as activated charcoal, silica gel, porous polymers, etc.
(1) Calibrate each personal sampling pump at the desired flow rate with a representative solid sorbent tube in line (alternatively, use a flow restrictor to provide a pressure drop equal to that of the average solid sorbent tube). Use a bubble meter or equivalent flow measuring device.
(2) Break the ends of the solid sorbent tube immediately before sampling to provide an opening at least one-half of the internal diameter at each end.
