Technical Assistance Report No. TA-79-43, Randle Egbert, D.D.S. and Michael Getz, D.D.S. Milford, Ohio.
NIOSH 1980 Jul:16 pages
Environmental and medical surveys were conducted on August 2 and 3, 1979, to evaluate health hazards caused by nitrous-oxide (10024972) (N20) and mercury (7439976) vapors in the offices of two Ohio dentists (SIC-8021). The evaluation was requested by the doctors on behalf of the approximately 6 affected employees. Personal breathing zone samples for N20 ranged from 180 to over 1000 parts per million (ppm), and area samples ranged from 170 to over 1000ppm, exceeding the NIOSH standard of 25ppm. A leak testing survey revealed that one N20 tank was leaking, and the high pressure valve on the tank was defective. One of the work station low pressure connections also had a leak. Mercury vapor concentrations ranged from undetectable to 0.073 milligrams per cubic meter (mg/m3), which were below the OSHA standard of 0.1mg/m3. The authors conclude that the personnel in this dental office were overexposed to N20. They recommend that a scavenging system and an air sweep system be installed, that routine maintenance be performed on all anesthetic and suction equipment, and that hygienic procedures be employed when working, cleaning, or disposing of mercury contaminated materials and equipment.
NIOSH-Author; NIOSH-Technical-Assistance-Report; TA-79-43; Hazard-Unconfirmed; Region-5; Air-sampling; Air-contamination; Gases; Dentistry; Standards; Control-methods;
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Hazard Evaluation and Technical Assistance Branch, NIOSH, Cincinnati, Ohio, 16 pages, 15 references