Only one substance will do the job: hydrofluoric acid ... and perfluorooctanoic acid (PFOA) is classified as a persistent organic pollutant or “forever chemical” with toxic properties.

But one big change remains elusive, and that's a ban on refineries using a toxic chemical known as modified hydrofluoric acid. (McNary, 10/11) In other news — KQED: EPA Vows To Speed Cleanup Of Toxic ...

Note: First Aid must be started within seconds of HF contact in any form! Hydrogen fluoride and hydrofluoric acid cause severe, deeply penetrating burns to the skin, eyes and lungs. Although ...