True or false - If composite sample is used, a minimum of 3 composite dust samples should be collected for floor, sills & trough.

True or false - If composite sample is used, a minimum of 3 composite dust samples should be collected for floor, sills & trough.

• A. False
• B. Not specified
• C. Sometimes
• D. True

Answer: (D)

Composite sampling combines several small wipe samples from the same surface type into one combined sample that’s analyzed as a single result. When you use composites, you still need to represent each surface category you’re testing. For floor dust, window sills, and window troughs, that means creating one composite per category. If you’re collecting composites for all three surface types, you’ll end up with three composites in total. That’s why the statement is true: using composites requires at least three composite dust samples, one for each of floor, sills, and trough.

Composite sampling combines several small wipe samples from the same surface type into one combined sample that’s analyzed as a single result. When you use composites, you still need to represent each surface category you’re testing. For floor dust, window sills, and window troughs, that means creating one composite per category. If you’re collecting composites for all three surface types, you’ll end up with three composites in total. That’s why the statement is true: using composites requires at least three composite dust samples, one for each of floor, sills, and trough.