What is the material used for air filter membranes in air sampling?

The correct choice for air filter membranes used in air sampling is cellulose ester. This material is specifically chosen because it possesses excellent properties for capturing airborne particles, including asbestos fibers. Cellulose esters are effective in filtering due to their fine pore structure, which allows for high efficiency in retaining small particles while maintaining good airflow. This ensures accurate air sampling results, which is crucial in asbestos monitoring and evaluation.

In the context of air quality and asbestos sampling, the ability of a filter to accurately capture and retain potentially harmful substances while allowing for air to pass through is of utmost importance. Cellulose ester membranes are also compatible with a variety of solvents and do not react adversely with the samples being collected, which enhances the reliability of the analysis.

The other materials listed, while they have their own uses in various applications, do not provide the same level of efficiency and reliability in the context of air sampling for asbestos. This makes cellulose ester the preferred choice in this scenario.