So what nano-sized particulates bond well with it and can further be exploited to exit the body via sweat or piss?

The body should, technically, be able to be stimulated in such a way to also eject the material via a similar catalyst. Roads go both ways.

Metal-binding proteins like Ferric are literally effected by magnetism. And are also used to help blood flow. A reason we are tied to geo-magnetic phenom biologically.

A slight modification to a standing MRI device and a way to make someone sweat faster enough?

Thanks for this link.