Abstract
A practical evaluation was carried out on commercially available glass fiber filter materials for use in the high-volume sampling of atmospheric suspended particulates. Studies were carried out on the collection efficiency of the various filter materials under equilibration and nonequilibration conditions. Values were obtained of the ratio of decreased airflow through the filter at constant pressure drop as a function of particulate loading. It was concluded that improvements need to be made in the physical uniformity of the sampling matrices. A variation in suspended particulate values was observed employing standard techniques, but generally the filters were self-consistent. It was further concluded that the high-volume sampling method is only a semiquantitative measurement and that simpler and more accurate methods are required.