Performance Expectations for Dust Sampling.
NIOSH 1980 Sep:29 pages
Total and respirable dust samplers commonly used by industrial hygienists were evaluated. Analysis of the samplers included testing for analytical precision and penetration as a function of particle size, sampling bias, and overall accuracy. The inlet collection efficiency for total dust was estimated by computer under various sample collection conditions. Several filter cassettes did not collect representative aerosol samples. In calm air all of the cassettes sampled particles smaller than about 15 micrometers with less than 10 percent error. As wind was increased, both open and closed faced 37 millimeter cassettes oversampled particles larger than 15 micrometers. The oversampling became severe for 10 micrometer particles at wind speeds of 100, 200, and 500 centimeters per second. Preliminary calculations using the computer model gave a bias of 15 percent or more for the nylon cyclone sampler. The authors conclude that the most important area for future work is to develop personal dust samplers which are unaffected by ambient air currents.
Dust-collectors; Dust-sampling; Dust-analysis; Air-sampling-equipment; Analytical-methods; Air-sampling; Analytical-instruments;
NTIS Accession No.
Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, 29 pages, 22 references