SAMPLING OF GASEOUS POLLUTANTS ON SILICA GEL WITH 1400 mg TUBES

This paper describes a computer-controlled system to regulate solvent vapour concentrations in experimental inhalation devices. This system consists of an exposure chamber, a bubbler with a mass flow-meter, a monitor gas chromatograph and a computer. The frequency of automatic sampling was dependent upon the retention time of test materials. Flow-rate was corrected through a computer regulated bubbler as soon as the mean chamber concentration varied by more than 2.5% of a command level. Regulation coefficients were calculated by relating the concentration of vapours sampled with adsorbent tubes to the mean peak areas given by the monitor gas chromatograph. They were then fed into the computer allowing the actual concentration to be adjusted to the command level. Deliberately induced fluctuations in the level of acetone, ethanol and trichloroethylene, either sudden or progressive, were satisfactorily corrected as were fluctuations occurring normally during repeated exposures to ethanol. Variations were generally inferior to 5% of the command level.

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A programmed feedback control of solvent vapour concentrations in experimental inhalation chambers

Bonnet

Raoult

Delcourt

et al. 1987

J of Applied Toxicology

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Histopathological changes in the respiratory tract of mice exposed to ten families of airborne chemicals

Zissu

1995

J of Applied Toxicology

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The objective of this experimental work was to identify and compare the histopathological changes induced in the respiratory tract of Swiss mice exposed to repeated inhalation (4, 9 or 14 days) at typical concentrations of RD50, 0.3 x RD50 and 3 x RD50 of airborne chemicals. These substances were selected from ten chemical families: aldehydes, organic acids, alcohols, ketones, ethers, aromatic hydrocarbons, halogenated aromatic hydrocarbons, inorganic bases, amines and isocyanates. These experiments showed that the lesion intensity observed in the nasal passages varied with exposure duration and type of airborne chemical, but did not depend on the concentration of the substance. Results did not allow us to establish a relationship between the histopathological changes and the type of chemical family. No injuries were observed in trachea and lungs.

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Urinary excretion of phenols as an indicator of occupational exposure in the coke-plant industry

Bieniek¹

1997

International Archives of Occupational and Environmental Health

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SAMPLING OF GASEOUS POLLUTANTS ON SILICA GEL WITH 1400 mg TUBES

Cited by 4 publications

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A programmed feedback control of solvent vapour concentrations in experimental inhalation chambers

A programmed feedback control of solvent vapour concentrations in experimental inhalation chambers

Histopathological changes in the respiratory tract of mice exposed to ten families of airborne chemicals

Urinary excretion of phenols as an indicator of occupational exposure in the coke-plant industry

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