The maximum number of wipes permitted in a single testing container is?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (C)

In wipe sampling for lead, keeping sample integrity during transport is crucial. Limiting how many wipes go into a single container helps prevent wipes from contaminating each other, keeps labeling and tracking clear, and reduces the chance of moisture or handling issues affecting the samples. Four wipes in one container strike a practical balance between field efficiency and laboratory processing, while still maintaining separation and traceability of each wipe’s origin. Fewer than four would mean more containers and more handling, while more than four increases the risk of cross-contamination and sample confusion. So, the maximum number of wipes permitted in a single testing container is four.