Researchers in Spain recently published a paper describing the use of nanoremediation technology to clean soil at a brownfield site that was heavily contaminated with arsenic and mercury.
The research draws on a several lab-scale experiments that have shown the use of nanoscale zero-valent iron (nZVI) to be effective in reducing metal(loid) availability in polluted soils.
NOTE: The HazMat Manager website seems to be experiencing problems at the moment, so
here’s a 2018 article on earlier research of this type.