Monitoring methodology for gaseous hazards - passive monitors and portable instruments.
Scand J Work, Environ & Health 1983 Apr; 9(2):223-229
Three methods for monitoring gaseous hazards were evaluated. These monitoring devices include three passive organic vapor (POV) monitors, two carbon-monoxide (630080) (CO) monitors and a unique nitrogen-dioxide (10102440) (NO2) monitor. The POV monitors were tested with three concentrations of trichloroethylene (79016), hexane (110543), acetone (67641), methylene-chloride (75092) and toluene (108883). Two of the models were diffusion controlled devices and one was permeation controlled. The CO monitors, a General Electric model and an Energetics Science model, were evaluated at 3 concentrations of CO which were from 0.5 to 2 times the permissible exposure limit of 50 parts per million, at 30 to 80 percent RH and at 1 and 6 hour periods. Precision and accuracy were determined. The NO2 sampler, composed of an absorbing scroll packed with poroplastic films and two removable glass end sections, required the collection of 36 to 60 liter samples at a flow rate between 60 to 120 milliliters per minute, which were developed and colorimetrically analyzed. The results showed that under specified conditions POV monitors can be a viable alternative to traditional sampling methodologies. Their overall precision was good as judged by their average coefficients of variation. The CO monitors with their direct readout abilities proved themselves to be accurate sampling devices which could be used successfully as industrial hygiene tools. Their mean coefficients of variation were 0.161 and respectively. The desorption efficiency of the NO2 monitor averaged 105 percent and there was no significant sample loss after 14 days of storage, but the shelf life of the sampler was limited. The sampler was shown to be sensitive over the concentration range of with a 10 percent coefficient of variation. The author concludes that the NO2 sampler device can now be used to detect a wide range of hazardous air contaminants.
NIOSH-Author; Industrial-gases; Occupational-hazards; Safety-monitoring; Safety-research; Organic-vapors; Organic-solvents; Air-contamination; Air-monitoring; Industrial-hygiene;
Author Keywords: carbon monoxide; diffusion; nitrogen dioxide; organic vapors; permeation; personal monitoring
630-08-0; 10102-44-0; 79-01-6; 110-54-3; 67-64-1; 75-09-2; 108-88-3
Scandinavian Journal of Work, Environment and Health