[Dermal exposure to ethylenediamine in the petrochemical industry]. / Dermalno vuzdeistvie na etilendiamina v neftokhimichno proizvodstvo.

During an examination of 47 workers engaged in ethylenediamine production subjective complaints of the skin were registered in 39% of them. Professional contact allergic dermatitis (26%) prevail over the contact irritative (6.5%) and lead very often to a change of employment for the operators. The epicutanic test with ethylenediamine and diethylene-triamine gives respectively 32 and 20% positiveness with high relative part of latent allergy. At compensated pH of the skin the sample for alkalic neutralization is prolonged in 42.9% of the workers. The ethylenediamine dermal absorption at concentrations in the air of the working area about MAC, is shown with methemoglobinemia registered in 15 operators. The raised methemoglobin in blood could be used with success as indirect test for exposure in hygiene-toxicological studies of workers exposed to ethylenediamine and aliphatic amines.

[Basic work environment factors at the Kremikovtsi Coke Chemical Plant]. / Osnovni factori na rabotnata sreda v koksokhimichen zavod SMK "Kremikovtsi".

The investigations, carried out by the institute of Hygiene and Occupational Diseases, for the assessment of toxic-chemical and physical factors of the working environment in the metallurgical-chemical plant showed a high degree of air pollution with dust and high number of toxic substances, many of them manifestating an additive effect or effect of synergism. At certain working places the physical factors have manifested deleterious effect. On the base of the investigations carried out, recommendations are proposed for further investigations on proper assessment of the occupational risk and improvement of labour conditions.