[Carcinogenic N-nitrosamines in the tire industry].

The level of volatile carcinogenic N-nitrosamines (NA) was studied in the air of various technological sites of tyre production. Reported total levels of NA in air exceeded MACs set in certain countries for the same enterprises. For example, German total MAC for 12 carcinogenic NA is 1 g/m3. N-nitrosomorpholine appeared to have the highest level (91 g/m3), probably, because its derivatives are used as raw material for technological process. Relative rate of volatile NA release from rubber samples containing 4-nitrosodiphenylamine (modifier) was studied. The parameter was reported to have no influence on NA outlet in conditions simulating technological process. NA was detected by means of gas chromatography with thermal energy detector TEA 502A provided by Thermo Electron Corporation, USA. The article necessitates regulation of NA in tyre production and better rubber mixtures to control the pollution of atmosphere.