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Biomedical subjects

J Krajewski

Publications and source records attributed to J Krajewski.

At least 37 records · Page 2Linked to original sources
PubMed1982

[Use of the exposure test and the gas concentration measurements in the breathing zones for the evaluation of the workers' exposure to carbon disulfide].

Individual exposures to CS2 of 31 workers in a viscose rayon plant were examined by personal continuous air sampling and two versions of iodo-azide test (chronometric and titrimetric methods). The obtained results indicate that during occupational exposure there is no practical correlation between 8-hours time-weight average concentrations of CS2 in workers' breathing zones and the levels of CS2--metabolites in urine.

Air Pollutants↗
PubMed1981

[Gravimetric method of determining petroleum vapors in the air].

The method is based on drawing a known volume of air through a tube filled with activated carbon. Water vapour, adsorbed together with hydrocarbons is removed from charcoal by passing dry nitrogen. Drying with nitrogen does not result in any decrease in the quantity of hydrocarbon adsorbed. The quantity of hydrocarbons is determined by weighing the tube before and after sampling. The authors investigated the dynamics of drying the charcoal from adsorbed water as well as the efficiency of hydrocarbon adsorption on charcoal. In addition, they established the conditions for samples collection. The range of the method is from 250 g/m3 to 10 000 g/m3.

Air Pollutants↗
PubMed1981

[Occupational exposure to oil mist resulting from the use of cutting fluids].

Basing on literature data on toxic effects of oil mist as well as on the results of epidemiological studies, an airborne concentration of 5 mg/m3 of oil mist was suggested as a safe value and 10 mg/m3--as a limit value MAC. Analytical methods used to determine oil mist in the air were surveyed. The fluorescence method was regarded as the best one for evaluation of occupational exposure within low concentrations. Also the determination of polycyclic aromatic hydrocarbons seems to be advisable at the workstations where cutting fluids are used. A number of recommendations wee given aimed at a decrease in occupational risk at work with oils and oil emulsions used as a cooler.

Aerosols↗
PubMed1980

Comparison of methods for determination of desorption efficiencies.

Three methods for desorption efficiencey determination were compared with a reference dynamic method for 12 compounds. Only one of them gave values that were statistically different. The method, in which standard solutions of determined compounds in CS2 are injected onto charcoal, is recommended to all laboratories dealing with air analysis as it is simpler than the dynamic method. Independence of the desorption efficiency on charcoal loading was also confirmed. The desorption efficiences for individual compounds and their mixtures were found to be different.

Adsorption↗
PubMed1980

Retention of vinyl chloride in the human lung.

Experiments with volunteers showed that 42% of an inhaled dose of vinyl chloride is retained in the lungs. This value is independent of the concentration of vinyl chloride in the air. Elimination of vinyl chloride through the lungs is negligible since its concentration in expired air decreases immediately after the cessation of exposure.

Absorption↗
PubMed1980

[Determination of solvent vapors in the air during use of Butapren OBT III glue].

Gas chromatographic method was applied to determine the mixture of extraction benzine, benzene, toluene and ethyl acetate vapours. These are the components of several types of butapren glues. Optimum parameters of separation and estimation of those solvents were obtained with 10% Carbowax 20 M on 80 -- 100 mesh Chromosorb W column. Charcoal adsorption method with CS2 elution was used for air samples collection. In addition, a method was presented for extraction benzine calibration with solvents distilled from OBT-III Butapren glue.

Acetates↗
PubMed1980

[Determination of petroleum and benzene vapors in the air by gas chromatography].

A gas chromatographic method for determination of extraction naphtha and benzene has been developed. The best parameters of chromatographic separation were found. Under those conditions it is possible to estimate the total concentration of all ingredients of extraction naphtha as one peak clearly separated from benzene peak. Two methods of calibration curve preparation were considered. One of them consists in preparation of calibration curve from extraction naphtha standard solutions. The other one consists in preparation of calibration curve from standard extraction naphtha vapours adsorbed on charcoal.

Air Pollutants↗