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ASBESTOS-CONTAINING MATERIALS IN SCHOOL BUILDINGS: BULK SAMPLE ANALYSIS QUALITY ASSURANCE PROGRAM-BULK SAMPLE ROUNDS 9, 10, 11 AND BLIND ROUND 2
Citation:
Pasquini, D., M. Parris, AND L. Laird. ASBESTOS-CONTAINING MATERIALS IN SCHOOL BUILDINGS: BULK SAMPLE ANALYSIS QUALITY ASSURANCE PROGRAM-BULK SAMPLE ROUNDS 9, 10, 11 AND BLIND ROUND 2. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-85/047 (NTIS PB85246999), 1985.
Description:
The report presents the results of laboratories participating in the nineth, tenth, eleventh and second blind round(s) of the bulk sample analysis quality assurance program sponsored by the U.S. Environmental Protection Agency. Two hundred fifty-four, 320, 318, and 50 laboratories which analyze bulk samples for determination of asbestos content by polarized light microscopy participated in these rounds, respectively. Laboratories received bulk samples of asbestos, asbestos substitutes or other bulk insulation materials. Three aspects of analytical results are considered: classification of a sample as either asbestos (positive) or nonasbestos (negative); identification of the specific type of asbestos present; and quantitation of the relative amount of major constituents present. A performance rating was made for each laboratory, based only on the ability to correctly classify samples. Reductions of all correct (4/4 or 3/3) scores were made only for the reporting of false positives and false negatives. Laboratories participating in rounds 9, 10, 11 and the second blind round correctly classified 92.1%, 97.2%, 94.9% and 97.9% of the samples, respectively, as an asbestos or nonasbestos containing material as described in the Federal Register, Vol. 47, No. 103, Thursday, May 27, 1982.