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The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

PB91184507

Publication Date	1969
Personal Author	Bayer, S. G.; Zumwalde, R. D.; Brown, T. A.
Page Count	20
Abstract	A simple and inexpensive sampling method was described for the determination of concentrations of asbestos (1332214) dust in the air for comparison with established hygiene limits. The results obtained were reproducible. The method used disposable plastic membrane filter holders, preloaded with membrane filters. These membrane filters may be made transparent and the asbestos fibers then counted with a phase contrast microscopy at 430X or 400X. The Asbestosis Research Council in Great Britain has used the method as has the United States Public Health Service. This was also the method specified in the proposed change for asbestos in the 1968 Threshold Limit Values of the American Conference of Governmental Industrial Hygienists. The details of the equipment needed and the procedure to be followed if one is to obtain reproducible results were described.
Keywords	Asbestos Air sampling Filters Chemical analysis Industrial hygiene Air pollution monitoring CAS 1332-21-4
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	99A - Analytical Chemistry 94D - Job Environment 41I - Job Environment
Corporate Authors	Bureau of Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199116

Equipment and Procedures for Mounting Millipore Filters and Counting Asbestos Fibers by Phase Contrast Microscopy.

Equipment and Procedures for Mounting Millipore Filters and Counting Asbestos Fibers by Phase Contrast Microscopy.
PB91184507

Publication Date	1969
Personal Author	Bayer, S. G.; Zumwalde, R. D.; Brown, T. A.
Page Count	20
Abstract	A simple and inexpensive sampling method was described for the determination of concentrations of asbestos (1332214) dust in the air for comparison with established hygiene limits. The results obtained were reproducible. The method used disposable plastic membrane filter holders, preloaded with membrane filters. These membrane filters may be made transparent and the asbestos fibers then counted with a phase contrast microscopy at 430X or 400X. The Asbestosis Research Council in Great Britain has used the method as has the United States Public Health Service. This was also the method specified in the proposed change for asbestos in the 1968 Threshold Limit Values of the American Conference of Governmental Industrial Hygienists. The details of the equipment needed and the procedure to be followed if one is to obtain reproducible results were described.
Keywords	Asbestos Air sampling Filters Chemical analysis Industrial hygiene Air pollution monitoring CAS 1332-21-4
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	99A - Analytical Chemistry 94D - Job Environment 41I - Job Environment
Corporate Authors	Bureau of Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199116