Surface Acoustic Wave (SAW) Personal Monitor for Toxic Gases.
Jarvis-NL; Wohltjen-H; Lint-JR
NIOSH 1991 Feb:73-83
Surface Acoustic Wave (SAW) coatings were evaluated for use in personal monitors for toxic gases. A demonstration model was developed which had four sensors. The unit weighed about 2 pounds. The sensor coatings reacted irreversibly with toxic gases so that total exposure could be measured. Gases studied included hydrogen- chloride (7647010), nitrogen-dioxide (10102440) (NO2), sulfur- dioxide (7446095), hydrogen-sulfide (7783064), and ammonia (7664417). It was noted that for each toxic gas except NO2 a relatively large and easily measured SAW response was observed when an appropriate coating was exposed to small concentrations. Aside from NO2, each toxic gas studied could be detected by a SAW sensor well below the OSHA action level when monitored over a period of 1 minute or less. The findings of the study indicated that: SAW sensors and necessary support electronics can be appropriately miniaturized; a number of successful coatings are readily available and others can be identified or developed; and SAW sensors are sensitive enough to meet the requirements. The authors conclude that a SAW personal monitor for toxic agents could readily be developed. Such a small, sensitive, and rugged solid state instrument will likely have many other applications in the future of monitoring systems.
Monitoring-systems; Air-monitoring; Toxic-gases; Sulfur-oxides; Nitrogen-oxides; Work-environment; Acid-gases; Occupational-exposure;
7647-01-0; 10102-44-0; 7446-09-5; 7783-06-4; 7664-41-7;
Field Screening Methods for Hazardous Wastes and Toxic Chemicals. Second International Symposium, February 12-14, 1991. Sponsored by U.S. EPA; E.S. DOE; U.S. Army Toxic and Hazardous Materials Agency; U.S. Army Chemical Research Development and Engineering Center; U.S.A.F.; Florida State Univ.; National Environmental Technology Applications Corp.; and NIOSH