I was thinking 'drop yellow sulfur over the floor' as I read the first paragraph and when the fire officers arrived. As I read the rest of the article and found the section that describes the source and progress of the spill, I realised that a more radical cleanup would be needed.

I'm in my late 50s and we used to use mercury liberally at school and after. I'm talking half a gallon of the stuff to demostrate the Toricelli vacuum, and later at University for floating bearings. Always dirty on surface, so low vapour. Bucket of sulfur in the lab. I'm not recommending a return to those days (benzene, carbon-tet, acetone on tap &c).