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Published byStuart Porter Modified over 9 years ago
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Filter Media-MCEF
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MCEF Uses MCEF Uses In line collection point for asbestos or metals Purpose Purpose Collection of select contaminants Serves as “capture” point of sampling train for later analysis
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Filter Media-MCEF Asbestos sampling Asbestos sampling Collects fibers from sampled air Metals sampling Metals sampling Collects only metal particulate On filter surface and within filter itself
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Filter Media-MCEF Operating parameters Operating parameters Requires high-flow pump 37mm cassette filter holder Asbestos (.5-16L/min) 25mm.8um filter pad, 3 stage extended cowl cassette25mm.8um filter pad, 3 stage extended cowl cassette Metals(1-3L/min) 37mm.8um filter pad, 3 stage cassette37mm.8um filter pad, 3 stage cassette
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Filter Media-MCEF Method of analysis 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
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Filter Media-MCEF Method of analysis 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)Atomic absorption spectroscopy(AAA) Inductively couple plasma emission spectroscopy(ICP)Inductively couple plasma emission spectroscopy(ICP)
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Filter Media-MCEF Calibration is performed with representative MCEF sampling media in line 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
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Filter Media-MCEF Filter Cassettes for asbestos Filter Cassettes for asbestos Filter Cassette for metals Filter Cassette for metals
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References Cited SKC Inc. Corporate Web Page http://www.skcinc.com/http://www.skcinc.com/ accessed 04/03/01 http://www.skcinc.com/
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Bibliography DiNardi Salvatore R. (1998) The Occupational Environment-Its Evaluation and Control, AIHA, Fairfax, Virginia 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 Goetsch David L. (1999) Occupational Safety and Health for Technologists, Engineers, and Managers, Prentice Hall, Upper Saddle River, New Jersey
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