An evaluation of a passive monitor for mercury vapor.
McCammon-r; S-CS; Woodfin-JW
Am Ind Hyg Assoc J 1977 Aug; 38(8):378-386
A personal passive mercury (7439976) vapor monitor was evaluated. Three dynamic sampling methods, a tandem mercury sampler, a method using iodine impregnated charcoal tubes for collection of total mercury, and a method using Hopcalite were compared to the passive monitor. A mercury generation system developed by NIOSH was used. An exposure monitor chamber was used to determine the effect of different face velocities. Face velocities of approximately 50, 100, 150, 200, and 250 feet per minute were tested. Accuracy and precision of the methods were determined. The passive monitor was tested for interference from chlorine (7782505), hydrogen-sulfide (7783064), and sulfur-dioxide (7446095). There were large variations in the amount of mercury compared with the charcoal tube. The passive monitor showed excellent correlation with those taken with the tandem tubes over all face velocities. Precision and accuracy data for the passive monitor were excellent. High concentrations of chlorine interfered with the accurate measurement of mercury. There was a slight interference from combined concentrations of hydrogen-sulfide and sulfur-dioxide. Diffusion for collection of mercury vapors and diffusion rate changed with temperature. The authors conclude that the passive monitor is accurate and precise for measuring mercury.
NIOSH-Author; Quantitative-analysis; Exposure-levels; Analytical-models; Monitoring-systems; Trace-analysis; Airborne-particles; Analytical-methods; Monitors;
7439-97-6; 7782-50-5; 7783-06-4; 7446-09-5;
American Industrial Hygiene Association Journal