Performance of thick-sorbent diffusive samplers.
Bartley-DL; Woebkenberg-ML; Posner-JC
Ann Occup Hyg 1988; 32(3):333-343
A study of the performance of thick sorbent diffusive samplers was presented. A mathematical model was compared to results of an experiment employing the Draeger ORSA5 sampler response to trichloroethylene (79016) concentration pulses over an 8 hour time period. A liquid sorbent sampler from GMD Systems was tested for measuring acetone (67641) and methanol (67561). The ORSA5 system was tested using activated charcoal. A weakly binding analyte, trichloroethylene was pumped into the sampler. Samples were taken at hourly intervals after the sampler was moved to a trichloroethylene free environment. The errors in estimates were between minus 17 and 51 percent with the extremes occurring at the beginning or end of the testing period. A similar test system using water as the sorbent and methanol and acetone as the analytes resulted in bias errors that were greater than the charcoal system. The authors conclude that if the analyte is weakly bound to the sorbents, materials can be lost to the atmosphere. With adequate information they may be appropriate samplers in some situations.
NIOSH-Author; Air-sampling; Air-samplers; Chlorinated-hydrocarbons; Air-sampling-equipment; Sampling-methods; Air-sampling-techniques; Absorbers; Mathematical-models
79-01-6; 67-64-1; 67-56-1
Annals of Occupational Hygiene