P Cherneva

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These studies, centering on occupational environmental factors, biologic monitoring, and toxicodynamic investigations, involved a total of 105 workers distributed into eight job groups, who were 45 years, of age on the average and had from 5 to 10 years of special occupational experience at "Electrosteel" Works. Evidence was obtained for presence of(More)
The data on airborne dust and occupational disease in the main dust-related industries of the People's Republic of Bulgaria are generalized and analyzed for a period of 15 years. In the ore producing industry is established a stability in the concentration of total and respirable dust 1-2 TWA concentrations and decrease of silica content in dust. The(More)
The existing method of electron microscope study of working environment pollutions caused by submicroscopic aerosols are summed up and subjected to critical analysis. More particularly, reference is made to the methods of detecting dust particles in the disperse medium for electron microscope study, to determination of the scope of application of these(More)
The study embraces the shops: metallurgic, electrolysis, production of sulfuric acid and shop 100. Tests are performed on the environmental pollution by dust, sulfur dioxide, chlorine, aerosols of sulfuric acid, carbon monoxide, nitric oxide and dioxide, hydrogen chloride, arsenic (II) oxide (III), selenium, tellurium and metal aerosols: lead, copper,(More)
The method is a contribution in the evaluation of the exposition and the control of the standards for organic powders. The method concerns the sample-taking procedure and the analysis-making technique for determining of the concentration of the microbial pollution of the air. It is based on filtering of some amount of air through a membrane filter which is(More)
Concentrations of adverse substances in air emissions of a copper manufacture have been determined. There have been found out dust, soot, copper, tin, lead. The generated emissions of these toxic elements from the investigated point generator are not above the admissible ranges and the established technologic conditions are not problematic. The(More)
The variability of the dust concentration in time and space, as well as the change of worker's place during the working process, define the necessity of introducing personal sampling in the hygiene control practice. However, the laboratory equipment with personal devices is still not sufficient. The aim of this work is to assess the dust exposure of the(More)
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