Electrochemical Quantification of Lead Adsorption on TiO 2 Nanoparticles

This work describes a rapid easy‐to‐use electrochemical method for quantifying lead (Pb 2+ ) adsorption on metal oxide nanoparticles (NPs), demonstrated here for titanium dioxide (TiO 2 ). The method was able to quantify Pb 2+ adsorption for concentrations as low as 0.95 μM, and up to 200 μM in NP dispersions, and to differentiate ion uptake in the presence and absence of a natural organic material, humic acid (HA). The method was selective for Pb 2+ against Cu 2+ , As 3+ , Zn 2+ , Cd 2+ and Cr 3+ ions when measured in the specific potential range from −0.4 to −0.6 V and was successfully demonstrated in water and home‐collected dust.