Home lead detection with color-changing wipes ^{CEFR B1}

Lead in the home is a known health hazard for children, and standard inspections use X-ray fluorescence (XRF) devices. These professional tests are expensive, often done only after a child is poisoned, and can take weeks for results. A recent study validated a faster, cheaper screening method that families could use immediately.

Researchers from the University of Washington School of Public Health and Boston University School of Public Health tested colorimetric wipes developed by the National Institute for Occupational Safety and Health. The team collected 104 wipes from nine homes and seven vehicles of Boston-based construction workers who live with children. In the presence of lead, the wipes changed to light orange, orange, or red to indicate low, medium, or high levels. The wipes detected lead on nearly 60% of home surfaces and 71% of vehicles and correctly identified most contaminated and uncontaminated surfaces, with a low rate of false negatives.

Wipes found lead on floors, shoes, laundry appliances, trunks, and painted surfaces such as windowsills. Kitchens had the highest lead levels in homes, and trunks had the highest levels in cars. The study notes the wipes cost about $2–$10 per sample compared with $60–$160+ for lab tests and recommends more research and wider testing before changing residential guidance.