New York State Asbestos Investigator Practice Exam

According to NYSDOH NOB, what method must be used for the analysis of certain asbestos materials?

1. Polarized light microscopy (PLM)

2. Scanning electron microscopy (SEM)

3. Transmission electron microscopy (TEM)

4. Infrared spectroscopy

The correct answer is: Transmission electron microscopy (TEM)

The correct answer reflects the requirement set forth by the New York State Department of Health (NYSDOH) regarding the analysis of certain asbestos materials. Transmission electron microscopy (TEM) is a highly sensitive technique that allows for the identification of asbestos fibers at a very fine scale. This method is particularly suitable for analyzing samples that may contain low concentrations of asbestos or for distinguishing between asbestos and non-asbestos fibers. TEM offers advantages over other methods due to its ability to provide detailed images of the material at the nanometer scale, facilitating a more accurate diagnosis of asbestos presence. When analyzing bulk samples where asbestos material may be mixed with other substances, TEM's sensitivity is paramount in ensuring compliance with safety regulations and protecting public health. While polarized light microscopy (PLM) is also a valid method used for asbestos identification, it is generally used for bulk material analysis where the fibers are more easily identified and classified. Scanning electron microscopy (SEM) is useful for surface morphology characterization, and infrared spectroscopy is more effective for identifying organic materials rather than mineral fibers like asbestos. The specificity and sensitivity of TEM make it the preferred choice by the NYSDOH for certain cases, particularly those involving complex mixtures or low concentrations of asbestos.