Filter MediaMCEF Filter MediaMCEF Uses u In line

Filter Media-MCEF

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

Filter Media-MCEF n Asbestos sampling u Collects fibers from sampled air n Metals sampling u Collects only metal particulate t On filter surface and within filter itself

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

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

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

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

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

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

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