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PCM ASTM D7200

Category Asbestos Lab Services
Test PCM ASTM D-7200
Description
Sampling and Counting Airborne Fibers Including Asbestos Fibers, in Mines and Quarries, by Phase Contrast Microscopy and Transmission Electron Microscopy
 
  • This ASTM standard is based on other PCM methods including the NIOSH 7400, OSHA ID-160 and ISO 8672.
  • For the determination of the concentration of fibers/ml of air by PCM
  • Fibers counted are placed into three different groups:
  • Group 1: fibers showing curvature, have splayed ends or appear as bundles
  • Group 2: fibers longer than 10 microns or thinner than 1 micron
  • Group 3:  All other countable fibers
  • If the PCM concentration exceeds ½ the PEL or TLV then examine the data to determine if 50% of the countable fibers fall into group 1 and 2.  If so then there is an increased chance that asbestos is present in the sample and TEM should be employed to supplement the PCM analysis.
  • The method gives guidance for “differential counting”  which can help to indicate whether the fibers in question are asbestiform (vs. cleavage fragments for example)

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