The preferred field instrument used in lead-based paint inspections is:

• A. Wet chemical field test kits (sodium sulfide or sodium rhodizonate)
• B. X-ray fluorescence analyzer
• C. Infrared (IR) Spectrometry
• D. ICP-AES

Answer: (B)

In lead-based paint inspections, you want a tool that can quickly tell you whether lead is present and in what amount, without damaging the coating. A portable X-ray fluorescence analyzer fits this need perfectly. It works by emitting X-rays to excite atoms in the paint and then detecting the characteristic X-rays that come from lead. This yields a direct, on-site concentration reading for the coating, allowing you to screen large areas rapidly and decide if remediation is required. It’s non-destructive, meaning you don’t have to take paint chips or send samples to a lab, which speeds up the process and reduces costs.

Wet chemical field test kits can be destructive or semi-quantitative and are less reliable for surveying wide areas. Infrared spectrometry detects organic materials and binders, not metals like lead, so it can’t quantify lead content. ICP-AES requires sample digestion in a lab and isn’t a practical field instrument.