Which type of blank sample is opened and resealed immediately at the worksite?

Which type of blank sample is opened and resealed immediately at the worksite?

• A. Field Blanks (FB)
• B. Partial Period Consecutive Sampling
• C. Media Blanks (MB)
• D. Confined Spaces

Answer: (A)

Blank samples act as controls to detect contamination that can be introduced during the sampling process, handling, or transport rather than from the workplace air. Opening a field blank at the worksite and resealing it immediately ensures it goes through the same steps as a real sample—loading, running through the pump and tubing, and transport—without actually collecting workplace air. This way, any contaminants found in the blank after analysis point to contamination from the sampling setup itself (equipment, handling, or transport) rather than the worker’s environment, which helps validate the integrity of the real samples. Media blanks are prepared to test the sampling media itself and aren’t opened and resealed in the field, while the other terms describe sampling settings or strategies rather than a blank type.

Blank samples act as controls to detect contamination that can be introduced during the sampling process, handling, or transport rather than from the workplace air. Opening a field blank at the worksite and resealing it immediately ensures it goes through the same steps as a real sample—loading, running through the pump and tubing, and transport—without actually collecting workplace air. This way, any contaminants found in the blank after analysis point to contamination from the sampling setup itself (equipment, handling, or transport) rather than the worker’s environment, which helps validate the integrity of the real samples. Media blanks are prepared to test the sampling media itself and aren’t opened and resealed in the field, while the other terms describe sampling settings or strategies rather than a blank type.