Technical Assistance Report No. TA-78-62, Louisiana State University, School of Dentistry, New Orleans, Louisiana.
NIOSH 1979 Feb:11 pages
Environmental and personal air samples were analyzed at the Louisiana State University School of Dentistry (SIC-8221), New Orleans, on October 2 and 3, 1978, to determine exposures to toxic concentrations of nitrous-oxide (10024972), mercury (7439976) vapor, and formaldehyde (50000). The evaluation was requested by the safety director on behalf of an unidentified number of dental students and school employees. Exposure to nitrous-oxide was studied by infrared analysis. A direct reading device evaluated mercury contamination and detector tubes evaluated formaldehyde. Nitrous-oxide environmental concentrations were less than 3.0 parts per million (ppm), but personal sample concentrations in the senior dental clinic ranged from 38 to 132ppm. The NIOSH recommended criteria for nitrous-oxide is 25ppm. The anesthesia/analgesia machine had numerous nitrous-oxide leaks. Mercury vapor concentrations in the Participation Clinic generally were less than standard of 0.1mg/Cu m. Formaldehyde concentrations generally were less than 1.0ppm, below the OSHA standard of 3.0ppm. The investigators conclude that some dental students and school employees still were being exposed to excessive concentrations of nitrous-oxide, even though a waste anesthetic gas scavenging system had been installed recently. They recommend the installation of a separate high vacuum scavenging line, regular preventive maintenance, frequent leak testing of anesthesia equipment, and an inhouse nitrous-oxide air monitoring program.
NIOSH-Author; NIOSH-Technical-Assistance-Report; TA-78-62; Region-6; Hazards-Confirmed; Air-sampling; Health-surveys; Anesthetics; Industrial-hygiene;
10024-97-2; 7439-97-6; 50-00-0;
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Hazard Evaluation and Technical Assistance Branch, NIOSH, Cincinnati, Ohio, 11 pages, 6 references