Filter Media-MCEF

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

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

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

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

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)

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

Filter Media-MCEF Filter Cassettes for asbestos Filter Cassettes for asbestos Filter Cassette for metals Filter Cassette for metals

References Cited SKC Inc. Corporate Web Page accessed 04/03/01

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