A new electromagnetic method for analyzing urban road dust

Road dust is a key urban pollutant and indicator of environmental contamination from traffic and industry. Conventional analysis methods are often slow, expensive, and require complex preparation. This study presents a novel electromagnetic method using electrical impedance spectroscopy (EIS) for road dust analysis. The technique leverages the eddy current effect with a specialized measuring coil to determine impedance components from sealed dust samples. Twenty samples from Warsaw, Poland, were analyzed, with results displayed as normalized impedance plots. These plots showed distinct characteristics, enabling clear differentiation of all samples. Magnetic susceptibility measurements confirmed a strong correlation with resistance changes, validating the method's sensitivity to magnetic mineral content. The results demonstrate that this approach provides a rapid, cost-effective, and non-destructive tool for distinguishing dust samples and assessing magnetic contamination. Furthermore, its electromagnetic nature suggests potential for detecting non-ferromagnetic heavy metals like lead, cadmium, and chromium, opening new avenues for environmental monitoring.