New York State Asbestos Investigator Practice Exam

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Why is PCM generally preferred over TEM for air sampling of asbestos?

PCM is more accurate and reliable
PCM is less expensive and easier to perform
PCM provides a faster turnaround time for results
PCM can detect more fiber types than TEM

The correct answer is: PCM is less expensive and easier to perform

The preference for Phase Contrast Microscopy (PCM) over Transmission Electron Microscopy (TEM) for air sampling of asbestos primarily relates to cost and ease of performance. PCM is a simpler and less resource-intensive technique to conduct as it requires less specialized equipment and technical expertise compared to TEM. While TEM is highly sensitive and can provide detailed information about fiber morphology and composition, it is much more complex and expensive to perform, requiring advanced training and significant laboratory resources. Therefore, for routine air sampling where the goal is to determine the presence of asbestos fibers in a more practical and cost-effective manner, PCM is often the method of choice. Additionally, PCM is widely accepted as the standard method for air sampling and is utilized in regulatory contexts, making it the practical option for environmental professionals.