Research Article
Application of Temperature Programmed Oxidation-Infrared Technique in the Analysis of Sulfur Occurrence and Genesis in Phosphate Rock
Table 2
Tmax of the currently completed sulfur reference materials.
| | Sample | Formula | Oxidation temperature of sulfur species | | Tmax1/°C | Tmax2/°C | Tmax3/°C | Tmax4/°C | Tmax5/°C | Tmax6/°C |
| | Sulfide | Ag2S | 554 | 634 | 652 | 678 | 918 | 941 | | MnS | 265 | 310 | 335 | 400 | 570 | 868 | | FeS | 230 | 513 | 655 | 933 | 961 | — | | Cu2S | 242 | 439 | 458 | 780 | — | — | | WS2 | 370 | 414 | 438 | 496 | — | — | | CoS | 423 | 486 | 783 | — | — | — | | ZnS | 820 | — | — | — | — | — |
| | Sulfate | CaSO4·2H2O | 1290 | 1315 | 1322 | 1333 | 1349 | 1352 | | H2NNH2H2SO4 | 265 | 281 | 282 | 283 | 398 | — | | CrK(SO4)·12H2O | 746 | 986 | 1048 | — | — | — | | Na2SO3 | 1094 | 1197 | 1300 | — | — | — | | (NH4)2S2O8 | 603 | 810 | 1054 | — | — | — | | FeSO4·7H2O | 534 | 648 | — | — | — | — | | MgSO4·7H2O | 1071 | — | — | – | — | — | | MnSO4 | 890 | — | — | — | — | — | | (NH4)2SO4 | 350 | — | — | — | — | — | | NiSO4·6H2O | 796 | — | — | — | — | — |
| | Organic sulfur | C18H29NaO3S | 189 | 446 | 655 | — | — | — |
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The symbol ‘—’ indicates no peaks appear at this temperature.
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