ABSTRACT
A personal passive dosimeter of the permeation type has been constructed for sampling organic gases and vapours in breathing zone air. In the dosimeter, paper coated with silicone rubber serves as a permeation membrane. The device has been calibrated for 14 organic substances. The experimentally determined sampling rate values for investigated compounds were independent of face air velocity and in almost all cases of compounds' concentration in the air. No difference between sampling rates for single compounds and their mixtures has been observed.
Subject(s)
Air Pollutants, Occupational/analysis , Environmental Monitoring/instrumentation , Gases/analysis , Hydrocarbons/analysis , Calibration , Equipment Design , HumansABSTRACT
Within the studies, three methodological versions of the determination of VI chromium with diphenylcarbazide have been evaluated. The versions differed primarily by the technique of elution (acid, alkaline) of the chromium sample from the filter. As optimum conditions for determining Cr VI in the presence of Cr III and Fe III, the parameters adopted by Carelli have been determined, some modifications being made consisting in improving and simplifying the analytical procedures, as well as making them more precise, and in the use of available materials.
