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Occurrence of nitrosamines in industrial atmospheres.
Rounbehler DP; Reisch JW; Coombs JR; Fine DH; Fajen J
Chemical Hazards in the Workplace, Measurement and Control, ACS Symp Ser 1981; :343-356
A survey of nitrosamine concentrations in leather tanneries (SIC- 3111) was conducted. Airborne concentrations of N- nitrosodimethylamine (138896) (NDMA) averaging 1.5 to 18 micrograms per cubic meter (microg/m3) were found at three of five surveyed tanneries. Only trace concentrations were detected at the fourth facility and none were detected at the fifth tannery. The tannery having the highest average NDMA concentrations, 18microg/m3, used dimethylamine-sulfate (21249138) (DMS) in their tanning operations. Waste water, process water, and a 36 percent solution of DMS used at this facility contained 6, 15, and 500 parts per billion NDMA, respectively. This tannery discontinued use of DMS and was reinspected 50 days later. At that time, average airborne NDMA concentrations had dropped to 2.4microg/m3. No NDMA could be detected in the waste water. Two air samples at the tannery having only trace amounts of NDMA contained 0.1 and 0.25microg/m3 N- nitrosomorpholine. The authors note that they were unable to identify the source of the NDMA. They suggest that NDMA is being formed in the air or on surfaces; thus any environment where nitrosatable amines and nitrogen oxides occur in a confined atmosphere is likely to be contaminated with N-nitroso compounds.
Exposure-levels; Workplace-studies; Industrial-hygiene; Toxic-effects; Hazards; Workers; Atmosphere-analyzers; Analytical-models; Nitrosoamines; Industrial-hazards
Chemical Hazards in the Workplace, Measurement and Control, ACS Symposium Series No. 149
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Content source: National Institute for Occupational Safety and Health Education and Information Division