What is the sample size when taking a dust wipe from the floor?

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Multiple Choice

What is the sample size when taking a dust wipe from the floor?

The key point is the standard floor wipe sampling area used in lead dust testing. For floors, a one-square-foot area is wiped to ensure the result represents the floor surface and can be compared to regulatory thresholds. A 12 by 12 inch square equals one square foot, which is why this choice is the correct sample size. Smaller areas (like 8x8 or 4x4) aren’t the standard for floor wipes, and a much larger area (24x24) isn’t typically used for routine floor sampling. So the appropriate sample size is a 12 by 12 inch square.

The key point is the standard floor wipe sampling area used in lead dust testing. For floors, a one-square-foot area is wiped to ensure the result represents the floor surface and can be compared to regulatory thresholds. A 12 by 12 inch square equals one square foot, which is why this choice is the correct sample size. Smaller areas (like 8x8 or 4x4) aren’t the standard for floor wipes, and a much larger area (24x24) isn’t typically used for routine floor sampling. So the appropriate sample size is a 12 by 12 inch square.

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