PCDDs, PCDFs, and PCBs co-occurrence in TiO sub(2) nanoparticles

In the present study, we report on the co-occurrence of persistent organic pollutants (POPs) adsorbed on nanoparticular titanium dioxide (TiO sub(2)). We report on the finding of polychlorinated dibenzodioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and polychlorinated biphenyls (PCBs) on the surface of commercially available TiO sub(2) nanoparticles, being formed during the fabrication process of the TiO sub(2). Thereby, the samples comprise PCBs with higher congener numbers or, in the absence of PCBs, a high concentration of PCDDs and PCDFs. This new class of POPs on an active catalytic surface and the great range of applications of nanoparticular TiO sub(2), such as in color pigments, cosmetics, and inks, give rise to great concern due to their potential toxicity.