An asbestos sample filter clearing procedure.

Details

• Personal Author:
  Baron, Paul A. ; Pickford GC
• Description:
  A rapid asbestos (1332214) sample filter clearing procedure was described. The procedure was based on the flash vaporization of a small amount, usually around 0.20 milliliters, of acetone injected into a heated metal block. The vapor was transported through the block and condensed on the filter. The entire procedure (injection and condensation) took less than 5 seconds. The method was tried with a large number of cellulose ester or nitrate membrane filters containing asbestos samples. Samples that were consistently flat, not wrinkled, fully cleared, and containing no air bubbles were obtained. Design specifications of the metal block and associated heating apparatus were presented. Precautions specific to the method were also presented. The authors conclude that the use of flash vaporization reduces the amount of acetone required, thereby making the procedure significantly more safe than other acetone clearing techniques. The procedure clears the filter in a more complete and consistent fashion than methods previously recommended. The authors recommend that the procedure be included in any future revision of NIOSH method 7400 for clearing asbestos sample filters. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Asbestos Inorganic Chemicals Laboratories Microbiology Occupational Health Safety
• Keywords:
  Air-filters Asbestos-fibers Filter-membranes Industrial-hygiene Laboratory-techniques Laboratory-testing Microscopic-analysis NIOSH-Author
• ISSN:
  0882-8032
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DPSE - Division of Physical Sciences and Engineering
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  169-171
• Volume:
  1
• Issue:
  4
• NIOSHTIC Number:
  nn:00174266
• Citation:
  Appl Ind Hyg 1986 Nov; 1(4):169-171
• CAS Registry Number:
  Asbestos (CAS RN 1332-21-4)
• Federal Fiscal Year:
  1987
• Peer Reviewed:
  True
• Source Full Name:
  Applied Industrial Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:bc37846caab2276f5c7810d67e11e06df8b00f8a2baafcb87d961d5b1e4aceb7c249aee101d8c146262ba324f4c9e58ba3ea85f95055f5b1d0c83919c38f7903
• Download URL:
  https://stacks.cdc.gov/view/cdc/185308/cdc_185308_DS1.pdf
• File Type:
  [PDF - 477.82 KB ]