| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 1 | DF | TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15} |
| 179 | DF | .~ Alkali metal (Li, Na, K, Rb, or Cs) {12} |
| 206.1 | DF | .~.~ Mixture contains organic or carbonaceous impurity {2} |
| 207 | | .~.~.~ Burning the impurity |