Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

The WHO/EURO man-made mineral fiber reference scheme

WHO/EURO Technical Committee for Monitoring and Evaluating MMMF
Scandinavian Journal of Work, Environment & Health
Vol. 11, No. 2 (April 1985), pp. 123-129
Stable URL: http://www.jstor.org/stable/40965197
Page Count: 7
  • Read Online (Free)
  • Download ($23.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The WHO/EURO man-made mineral fiber reference scheme
Preview not available

Abstract

At a consultation arranged by the World Health Organization's Regional Office for Europe in 1980 a reference method was specified for sampling and evaluating airborne dust samples collected in man-made mineral fiber (MMMF) workplaces. This method involves sampling onto a membrane filter and counting the fibers with the use of a phase contrast optical microscope (PCOM). The evaluation procedure has been tested by members of the WHO/EURO MMMF technical committee through a series of interlaboratory sample exchanges. The results from these trials have shown a consistent improvement in the reproducibility of MMMF counts, maximum systematic interlaboratory differences being reduced from 2.5 times to 1.4 times. This reduction has been achieved through harmonization of the subjective judgements made by microscopists. As this improved agreement was achieved, each laboratory's counting level changed; preliminary comparisons suggest that this occurrence would produce an approximately two-to threefold increase in the fiber concentrations reported during the epidemiology study of the Joint European Medical Research Board. Further work is currently being undertaken to quantify this change better. A reference method for sizing and counting airborne MMMF with a scanning electron microscope (SEM) has also been developed, and on the basis of preliminary experimental tests there has been some harmonization between the participating laboratories.

Page Thumbnails

  • Thumbnail: Page 
123
    123
  • Thumbnail: Page 
124
    124
  • Thumbnail: Page 
125
    125
  • Thumbnail: Page 
126
    126
  • Thumbnail: Page 
127
    127
  • Thumbnail: Page 
128
    128
  • Thumbnail: Page 
129
    129