||Validation of Samplers for Inhaled Particulate Matter.
John, Walter ;
Wall, Steven M. ;
Wesolowski, Jerome J. ;
||California Dept. of Health Services, Berkeley. Air and Industrial Hygiene Lab. Section.;Environmental Monitoring Systems Lab., Research Triangle Park, NC.
Air pollution ;
Field tests ;
Performance evaluation ;
Design criteria ;
Dichotomous samplers ;
Size selective hi-vols samplers
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Methods for the testing of new samplers for inhalable particles have been developed and applied to the dichotomous sampler and the size-selective hi-vol. The sampling effectiveness of the inlet to the dichotomous sampler was measured and found to be excessively dependent on wind speed. A modification to improve the performance has been designed as a retrofit to the existing inlet. Wall losses in the dichotomous sampler were measured to be small. The fine fraction is found to be correlated to error in nozzle concentricity which is out of specifications in the typical commercial sampler. Additional testing was carried out in ambient air using an array of side-by-side samplers including two dichotomous samplers, two Monocut samplers and the AIHL cyclone.