PRECIPITATION SCHEMES ASIDE, there remain several important categories of separation in inorganic analysis. In this chapter, we will discuss mercury cathode electrolysis, solvent extraction, ion exchange, and distillation/volatilization techniques, and at least touch upon fire assay. As in the previous chapter, for reasons of space and economy of effort on the part of both author and reader, the discussion will be confined to areas of the broadest utility in metals analysis. Since there is little that links this miscellany of isolation methodologies, perhaps it is best to just begin.