c832be2d_Facts_and_figures___SciDev_Net__Product
[How it works] Magnetic nanoparticles of iron oxide suspended in water bind arsenic, which is then removed with a magnet [Importance] India, Bangladesh and other developing countries suffer thousands of cases of arsenic poisoning each year, linked to poisoned wells [Developer] Rice University, United States [Product] 
Nanorust to remove arsenic
Nanotechnology for clean water: Facts and figures - SciDev.Net