| Chemical agent (1) | Typical application (removal of) |
|---|---|
| KOH | Hydrogen sulphide, sulphur dioxide, mercaptans, acid gases |
| NaOH | |
| K2CO3 | |
| Fe2O3 | Hydrogen sulphide and mercaptans |
| Cu/CrO | Hydrogen cyanide and sulphur compounds |
| KMnO4 | Hydrogen sulphide from non-oxidizing gases |
| KI / KI3 | Hydrogen sulphide, mercaptans, organic sulphides, radioactive and methyl iodide |
| CuO | Desulphurisation |
| H2SO4 | Ammoniac and amines, mercury |
| H3PO4 | Ammoniac |
| S | Mercury, dioxins |
| Ag (metallic) | Domestic water filters |