Asbestos PCM Fiber Counting Performance in the Proficiency Analytical Testing Program.
NIOSH 1995 Mar:71 pages
Phase contrast microscope (PCM) asbestos (1332214) fiber counting performance over a 20 year period of the Proficiency Analytical Testing (PAT) Program, from 1972 through 1992, was evaluated. Estimates were given for total variability, intracounter variability, and intercounter variability. In recent years the total variability of counting chrysotile (12001295) fibers improved by about 35%. The greatest improvement was noted in the last 6 months of 1978. Over a 6 year period, a comparison was also made of total, intercounter and intracounter variability for counting amosite (12172735) and chrysotile asbestos fibers. Amosite intercounter variability improved by about one third with large improvements occurring in the first year that amosite was included in the analysis program. Changes in PCM fiber counting methods, PAT participation, the American Industrial Hygiene Association Laboratory Accreditation Program, and PAT sample production were studied in an effort to determine the part each of these avenues played in improving the overall efficiency of the analysis results.
NIOSH-Author; Analytical-methods; Asbestos-fibers; Quality-control; Fibrous-dusts; Laboratory-techniques; Microscopic-analysis;
1332-21-4; 12001-29-5; 12172-73-5;
NTIS Accession No.
Division of Physical Sciences and Engineering, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, 71 pages, 11 references