Shaken for 3h with three portions of KMnO₄ soln (5g/L), twice for 6h with mercury (to remove sulfide impurities) until no further darkening of the interface occurred, and finally with a soln of HgSO₄ (2.5g/L) or cold, satd HgCl₂. Dried with CaCl₂, MgSO₄, or CaH₂ (with further drying by refluxing with P₂O₅). followed by fractional distn in diffuse light. Alkali metals cannot be used as drying agents. Has also been purified by standing with bromine (0.5mL/L) for 3-4h, shaking with KOH soln, then copper turnings (to remove unreacted bromine), and drying with CaCl₂. disulfide (CAS NO. ) is highly toxic and highly flammable. Work in a goodfumehood.

Small quantities of CS₂ have been purified (including removal of hydrocarbons) by mechanical agitation of a 45-50g sample with a soln of 130g of sodium sulfide in 150mL of H₂O for 24h at 35-40 °C. The aqueous sodium thiocarbonate soln was separated from unreacted CS₂, then ppted with 140g of copper sulfate in 350g of water, with cooling. After filtering off the copper thiocarbonate, it was decomposed by passing steam into it. The distillate was separated from H₂O and distd from P₂O₅.