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Asbestos PCM Fiber Counting Performance in the Proficiency Analytical Testing Program.

PB95219663

Publication Date	1995
Personal Author	Schlecht, P. C.; Shulman, S. A.
Page Count	174
Abstract	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.
Keywords	Asbestos Quality assurance Analytical methods Accuracy Proficiency Analytical Testing Program
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	99A - Analytical Chemistry 57U - Public Health & Industrial Medicine 94D - Job Environment
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH. Div. of Physical Sciences and Engineering.
Document Type	Technical Report
NTIS Issue Number	199516

Asbestos PCM Fiber Counting Performance in the Proficiency Analytical Testing Program.

Asbestos PCM Fiber Counting Performance in the Proficiency Analytical Testing Program.
PB95219663

Publication Date	1995
Personal Author	Schlecht, P. C.; Shulman, S. A.
Page Count	174
Abstract	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.
Keywords	Asbestos Quality assurance Analytical methods Accuracy Proficiency Analytical Testing Program
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	99A - Analytical Chemistry 57U - Public Health & Industrial Medicine 94D - Job Environment
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH. Div. of Physical Sciences and Engineering.
Document Type	Technical Report
NTIS Issue Number	199516