Which option correctly identifies a non-XRF method to test for lead on painted surfaces?

Which option correctly identifies a non-XRF method to test for lead on painted surfaces?

• A. Visual inspection
• B. Air sampling
• C. Paint chip sample
• D. XRF device

Answer: (C)

Taking a paint chip sample and sending it to a lab for chemical analysis is the non-XRF approach. You remove a tiny piece of paint from the surface and test it with lab methods (like atomic absorption spectroscopy or ICP) to quantify how much lead is present in that paint layer. This gives a precise concentration and can handle complex situations such as multiple paint layers where XRF readings might be ambiguous. It is a destructive method to the sampled area, but it yields definitive, specific lead measurements for the paint itself. Visual inspection doesn’t provide a quantitative lead measurement; it can only suggest potential issues based on signs or history. Air sampling looks at lead dust in the environment, not the lead content of the painted coating. An XRF device tests for lead directly on the surface without removing material, but that’s the method the question is asking to identify against.

Taking a paint chip sample and sending it to a lab for chemical analysis is the non-XRF approach. You remove a tiny piece of paint from the surface and test it with lab methods (like atomic absorption spectroscopy or ICP) to quantify how much lead is present in that paint layer. This gives a precise concentration and can handle complex situations such as multiple paint layers where XRF readings might be ambiguous. It is a destructive method to the sampled area, but it yields definitive, specific lead measurements for the paint itself.

Visual inspection doesn’t provide a quantitative lead measurement; it can only suggest potential issues based on signs or history. Air sampling looks at lead dust in the environment, not the lead content of the painted coating. An XRF device tests for lead directly on the surface without removing material, but that’s the method the question is asking to identify against.