https://phys.org/news/2018-05-analysis-pollutants-cosmetics-seawater.html > The key to this new method based on nanotechnology is the system known as Lab-on-Valve, used by the scientific community for sample analysis. More specifically, the research team led by Analytical Chemistry Professor Marisol Cárdenas has added carbon-coated titanium dioxide nanotubes to this system. Previously, the use of nanomaterials in the Lab-on-Valve system was not possible due to their tendency to aggregate in aqueous media. In this case, the University of Cordoba research group was able to synthesize nanoparticles with easy dispersion that were compatible with the Lab-on-Valve system. > The new system was recently described in the journal Analytical Chemistry. The study's primary author, University of Cordoba researcher María Teresa García Valverde, says, "The combination of the Lab-on-valve system, titanium nanotubes modified with amorphous carbon as phase extraction and the measuring tool connected to the system, allows for quantifying parabens and triclosan at very low concentrations." For the most part, these pollutants come from personal hygiene products such as soap, sunscreen, toothpaste and other toiletries. All of them have very negative effects on the environment.