What is the primary method used to identify lead in dust?

The primary method used to identify lead in dust is dust wipe sampling. This method involves collecting samples of dust from surfaces within a building and then analyzing those samples in a laboratory setting to determine the lead content. Dust wipe sampling is crucial as lead dust can be a significant hazard, especially in homes built before 1978 when lead-based paints were commonly used.

This technique allows trained assessors to quantify the amount of lead present, which is important for risk assessment and determining necessary remediation actions. It provides more conclusive evidence of lead presence compared to visual inspection, which might not capture hidden dust deposits. Surface testing generally involves directly assessing paint or other surfaces rather than the dust itself, and temperature assessment is irrelevant in identifying lead. Thus, dust wipe sampling stands as the definitive method for evaluating lead exposure risk from dust.