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Health hazard evaluation report: HETA-95-0023-2531, American Azide Corporation, Cedar City, Utah.
Esswein EJ; Trout DB; Hales T
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, HETA 95-0023-2531, 1995 Sep; :1-33
In response to a confidential request, an investigation was begun into possible exposures to sodium-azide (26628228) and hydrazoic- acid (7782798) at the American Azide Corporation (SIC-5169), Cedar City, Utah. Personal breathing zone samples indicated that concentrations of sodium-azide ranged up to 1.7mg/m3. Hydrazoic- acid levels ranged up to 1.1 parts per million (ppm). Sodium-azide levels exceeded the NIOSH recommended exposure level (REL) of 0.3mg/m3 in 28% of the samples and hydrazoic-acid exceeded the REL of 0.1ppm in 14% of the samples. On one occasion the air sample taken inside a supplied air helmet showed a hydrazoic-acid level of 0.13ppm which was greater than the 0.05ppm level recorded from samples on the worker's collar. The packaging and reblending operations appeared to be those in which workers were most at risk. Medical screening was performed on 11 workers, ten of whom reported headaches occurring in the production areas within 6 months of the evaluation. During that same time period, nine of the 11 reported low blood pressure episodes. Monitoring of a worker during azide packaging in the new blender and packaging building showed that the employee experienced an episode of hypotension, but the employee reported no symptoms. The authors conclude that exposures to sodium- azide and hydrazoic-acid exceeded the NIOSH REL, and health effects consistent with exposure were reported. The authors recommend specific measures to reduce exposures to these compounds.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; HETA-95-0023-2531; Hazard-Confirmed; Region-8; Chemical-manufacturing-industry; Chemical-industry-workers; Cardiovascular-system-disorders; Azides; Occupational-exposure; Author Keywords: Chemicals and Allied Products, Not Elsewhere Classified; sodium azide; hydrazoic acid; blood pressure; hypotension; headache; ambulatory blood pressure monitoring; biological monitoring
Field Studies; Hazard Evaluation and Technical Assistance
NTIS Accession No.
National Institute for Occupational Safety and Health
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