What is the method of analysis used for PCM?

The method of analysis used for Phase Contrast Microscopy (PCM) is NIOSH 7400. This method is widely recognized and established for the determination of asbestos fibers in air samples and other materials. NIOSH 7400 involves the collection of airborne particulate using a filter, followed by microscopic analysis to identify and quantify asbestos fibers based on their morphology.

This analysis method is critical for assessing potential exposure to asbestos in occupational settings, as it provides a standardized approach for fiber counting that is critical for compliance and safety evaluations. Understanding the importance of this method highlights its role in helping maintain workplace safety and health by accurately measuring airborne asbestos levels.

The other choices, while related to asbestos or occupational safety regulations, do not specifically refer to PCM methods. For instance, ASTM E-1368 relates to the standard guide for the identification of asbestos in materials, OSHA 1926 pertains to safety regulations in construction, and EPA 40 CFR covers a broad range of environmental regulations, rather than focusing directly on analytical methods like PCM.