![]() The sampling rate was determined to 0.356 mL min −1 ( CV 9.6%) and was not significantly affected by concentration, sampling time or relative humidity. Thus, apparatus 10 is able to obtain air samples directly from the breathing zone of the wearer, i.e., to obtain samples of air which are very similar to the air actually breathed by the wearer. As reference method, diffusive sampling with standard Perkin Elmer tubes, thermal desorption and gas chromatographic ( GC) analysis was used. representative of the public or worker breathing zone air samples. The new sampler was evaluated for the determination of styrene, both in laboratory experiments and in field measurements. Air sampling results before and after the High Efficiency Particulate Air (HEPA). When conducting air sampling to determine whether an employee will be exposed to airborne hazards in the workplace, personal air samples may be collected within the worker's breathing zone. Elapsed time meter and constant air flow rate permits calculation of accurate sample volume. Occupational Safety and Hazard Administration (OSHA) defines the breathing zone as the area within a ten-inch radius of the worker's face. Telescoping sampling gooseneck permits easy adjustment to breathing zone levels. The mini tube is thermally desorbed inside a standard PE tube. The breathing zone in a workplace is defined as the area closest to an employee's mouth and nostrils. A special tube holder to be used with a headset was designed for the mini tube. Both the size of the tube and the amount of adsorbent was decreased for the miniaturized sampler. The basis for this miniaturization was the Perkin Elmer ATD tube. 5. The purpose of this work was to study the performance of a miniaturized tube type diffusive sampler attached to a headset for true breathing-zone sampling. ![]() There are, however, difficulties if true breathing-zone sampling is to be performed, since available diffusive samplers normally cannot be arranged close to the nose/mouth. ![]() The diffusive samplers are normally attached on a shoulder, on a breast-pocket or on the lapel. In diffusive (passive) sampling, no extra equipment as sampling pumps is needed, making the measurements more acceptable to the user. TWA exposure for each employee on the basis of one or more personal breathing zone air samples that reflect the exposures of employees on each shift, for each. User-friendly sampling equipment, with a minimum of handling before, during and after measurement, should not affect ordinary work. Exposure measurements should be performed as close as possible to the nose and mouth for a more correct assessment of exposure. ![]()
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