Which sampling device is used for sampling gases and/or vapors?

Which sampling device is used for sampling gases and/or vapors?

• A. Adsorption Tubes
• B. Filter Cassettes
• C. Passive Dosimeters
• D. Personal Air Sampling

Answer: (A)

Capturing gas and vapor contaminants relies on a sorbent medium that traps vapor-phase molecules as air passes through it. Adsorption tubes are exactly this: small tubes packed with sorbent material (such as activated charcoal or other sorbents) that are connected to a calibrated pump. When air is drawn through the tube, vapor molecules adhere to the sorbent surface. After sampling, the amount collected is analyzed in the lab by desorbing the sample and using techniques like GC or GC-MS. Knowing the exact volume of air pulled through allows calculation of the contaminant concentration in air. This setup is designed specifically for gases and vapors, making it the go-to device for vapor-phase sampling. Filter cassettes, in contrast, are used to collect particulates on a filter, not gases. Passive dosimeters measure exposure over time via diffusion or other passive mechanisms, and personal air sampling is a broad approach that can use various devices, including adsorption tubes, but is not itself a specialized gas/vapor sampling device.

Capturing gas and vapor contaminants relies on a sorbent medium that traps vapor-phase molecules as air passes through it. Adsorption tubes are exactly this: small tubes packed with sorbent material (such as activated charcoal or other sorbents) that are connected to a calibrated pump. When air is drawn through the tube, vapor molecules adhere to the sorbent surface. After sampling, the amount collected is analyzed in the lab by desorbing the sample and using techniques like GC or GC-MS. Knowing the exact volume of air pulled through allows calculation of the contaminant concentration in air. This setup is designed specifically for gases and vapors, making it the go-to device for vapor-phase sampling.

Filter cassettes, in contrast, are used to collect particulates on a filter, not gases. Passive dosimeters measure exposure over time via diffusion or other passive mechanisms, and personal air sampling is a broad approach that can use various devices, including adsorption tubes, but is not itself a specialized gas/vapor sampling device.