Airborne asbestos measurement: preliminary findings identify a new source of variability in the membrane filter method.
Significant quantities of asbestos fibers have been found on the inside surfaces of the filter cassettes using the current membrane filter method (P&CAM-239). This introduces a major new source of random error not previously recognized in these measurements. This phenomenon is apparently due to the presence of electrostatic charges generated within the plastic filter cassettes.
D000395:Air Pollutants, Occupational / Q000032:analysis*; D001194:Asbestos / Q000032:analysis*; D004560:Electricity; D005374:Filtration / Q000295:instrumentation; D008567:Membranes, Artificial
D000395:Air Pollutants, Occupational; D008567:Membranes, Artificial; D001194:Asbestos