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Filter Media-MCEF

Filter Media-MCEF. Filter Media-MCEF. MCEF Uses In line collection point for asbestos or metals Purpose Collection of select contaminants Serves as “capture” point of sampling train for later analysis. Filter Media-MCEF. Asbestos sampling Collects fibers from sampled air Metals sampling

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Filter Media-MCEF

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  1. Filter Media-MCEF

  2. Filter Media-MCEF • MCEF Uses • In line collection point for asbestos or metals • Purpose • Collection of select contaminants • Serves as “capture” point of sampling train for later analysis

  3. Filter Media-MCEF • Asbestos sampling • Collects fibers from sampled air • Metals sampling • Collects only metal particulate • On filter surface and within filter itself

  4. Filter Media-MCEF • Operating parameters • Requires high-flow pump • 37mm cassette filter holder • Asbestos (.5-16L/min) • 25mm .8um filter pad, 3 stage extended cowl cassette • Metals(1-3L/min) • 37mm .8um filter pad, 3 stage cassette

  5. Filter Media-MCEF • Method of analysis • Asbestos • Filter pad is sectioned, and placed on PCM slide • Filter is then digested with acetone vapor leaving only collected fibers • Fibers are then counted with Walton-Beckett graticule • Particle with 3:1 or greater length:width ratio is counted • Presented results are in fibers per cc of air

  6. Filter Media-MCEF • Method of analysis • Metals • Important toxicologically to know both qualitative and quantitave properties of different metals present • Filter pad is dissolved or ashed • Remaining solution is analyzed by • Atomic absorption spectroscopy(AAA) • Inductively couple plasma emission spectroscopy(ICP)

  7. Filter Media-MCEF • Calibration is performed with representative MCEF sampling media in line • Rotameter • Flow is calibrated against ball “floating” in air in the chamber • Bubble tube(Manual or Electronic) • Flow is calibrated by timing bubble travel speed in vertical column

  8. Filter Media-MCEF • Filter Cassettes for asbestos • Filter Cassette for metals

  9. References Cited SKC Inc. Corporate Web Page http://www.skcinc.com/ accessed 04/03/01

  10. Bibliography • DiNardi Salvatore R. (1998) The Occupational Environment-Its Evaluation and Control, AIHA, Fairfax, Virginia • Goetsch David L. (1999) Occupational Safety and Health for Technologists, Engineers, and Managers, Prentice Hall, Upper Saddle River, New Jersey

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