For a composite sample, the number of wipes used can range from?

For a composite sample, the number of wipes used can range from?

• A. 1-2
• B. 2-4
• C. 3-5
• D. 4-6

Answer: (B)

When a composite wipe sample is used, you pool multiple wipe samples from the same surface into one analysis. The guideline for how many wipes to include in a composite is two to four. This range balances capturing variability across the surface with keeping the sample concentration high enough for reliable lab analysis. Using only one wipe isn’t a composite, and using more than four can dilute the lead concentration too much and make it harder to interpret where the contamination came from. So two to four wipes is the standard range for a composite wipe sample.

When a composite wipe sample is used, you pool multiple wipe samples from the same surface into one analysis. The guideline for how many wipes to include in a composite is two to four. This range balances capturing variability across the surface with keeping the sample concentration high enough for reliable lab analysis. Using only one wipe isn’t a composite, and using more than four can dilute the lead concentration too much and make it harder to interpret where the contamination came from. So two to four wipes is the standard range for a composite wipe sample.