Which sampling device is used for sampling particulates and fibers such as welding fumes and asbestos?

Which sampling device is used for sampling particulates and fibers such as welding fumes and asbestos?

• A. Adsorption Tubes
• B. Colorimetric Tubes
• C. Passive Dosimeters
• D. Filter Cassettes

Answer: (D)

Sampling airborne solids requires a medium that can capture particles for analysis. A filter cassette provides that capability: it houses a filter disk through which air is drawn with a calibrated pump, so particulates from welding fumes or asbestos deposit on the filter. This allows gravimetric determination of dust mass and enables subsequent microscopic analysis to identify and quantify fibers. For asbestos, filters are chosen to be compatible with fiber analysis methods (like PCM or TEM) after appropriate preparation. In contrast, adsorption tubes are used for gases and vapors, colorimetric tubes give quick readings for specific gases, and passive dosimeters measure exposure over time without collecting solid particles. So for sampling particulates and fibers, the filter cassette is the appropriate device.

Sampling airborne solids requires a medium that can capture particles for analysis. A filter cassette provides that capability: it houses a filter disk through which air is drawn with a calibrated pump, so particulates from welding fumes or asbestos deposit on the filter. This allows gravimetric determination of dust mass and enables subsequent microscopic analysis to identify and quantify fibers. For asbestos, filters are chosen to be compatible with fiber analysis methods (like PCM or TEM) after appropriate preparation. In contrast, adsorption tubes are used for gases and vapors, colorimetric tubes give quick readings for specific gases, and passive dosimeters measure exposure over time without collecting solid particles. So for sampling particulates and fibers, the filter cassette is the appropriate device.