What is the method of analysis used for air sampling in PCM?

The method of analysis used for air sampling in Phase Contrast Microscopy (PCM) is NIOSH 7400. NIOSH, the National Institute for Occupational Safety and Health, developed this method specifically for the analysis of airborne fibers, including asbestos. The PCM technique allows for the counting of fibers in air samples collected on a filter, facilitating the assessment of occupational exposure to asbestos.

This method is widely accepted and utilized in various exposure assessments due to its reliability and established protocols, making it the standard for air sampling in industries where asbestos exposure is a concern. It focuses on determining the concentration of fibers in the air, which is crucial for ensuring that exposure levels remain below regulatory limits and for protecting workers' health. The NIOSH 7400 method is essential in the risk assessment and management framework concerning asbestos, forming a solid basis for compliance and safety measures in workplaces.

The other options presented, while related to environmental and occupational safety, pertain to different analyses or contexts. For example, OSHA 2750 deals with asbestos sampling and analysis but it is not specifically about air sampling with PCM. The EPA 600 method is more focused on environmental measurements, and ASTM D7036 pertains to the testing methods applicable in various contexts but not specifically air