Abstract
Replicate aliquots of an aqueous suspension of amosite asbestos were filtered through either polycarbonate or cellulose membrane filters. The polycarbonate filters were prepared using a direct transfer (DT) method and analyzed using transmission electron microscopy (TEM) and phase contrast microscopy (PCM); the cellulose filters were treated and analyzed using National Institute for Occupational Safety and Health (NIOSH) Method P&CAM 239. Compared to the results of the TEM examination, approximately 93% and 146% of the amosite fibers longer than 5 µm were detected using the DT-PCM and NIOSH methods, respectively. Compared to the previous recoveries of chrysotile fibers of 47% by the DT-PCM method and 13% by the NIOSH method, the improvement in accuracy of the 2 methods in the analysis of amosite fibers was due to the fact that the difference in refractive index between the amosite fibers and the background was approximately 0.21, such that more than 98% of the amosite fibers longer than 5 µm were clearly ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
