| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 511 | DF | SULFUR OR COMPOUND THEREOF {4} |
| 567.1 | | .~ Elemental sulfur {5} |
| 568 | DF | .~.~> Chlorinating |
| 569 | DF | .~.~> Reducing sulfur dioxide by carbon containing material {1} |
| 571 | DF | .~.~> Reacting a sulfide {3} |
| 578.1 | DF | .~.~> Purifying crude sulfur {1} |
| 578.4 | DF | .~.~> From liquid or solid compound |