| Reagent | Se Detected | Result of Reaction | Detection Limit (µg/ml) | Interfering Substances |
|---|---|---|---|---|
| Thiourea | Se+4 | pink color or red ppt. | 5 | Te, NO2-, Cu, Hg, Bi, Au, Pt, Pd |
| Hydroxylamine HCl | Se+4 | pink color or red ppt. | 5 | many elements except Te |
| Iodide | Se+4 | red-brown ppt. | 40 | As+3, Ge +4, Mo+6 |
| Thiocyanic acid | Se+4 | red-brown ppt. | 2 | As, Sb, Sn, Fe+2, MoO 4-2 |
| Pyrrole | Se+4 | pyrrole blue color | 0.5 | oxidizing elements, Se+6, Te+4, Te +6 |
| Asymmetric diphenyl-hydrazine | Se+4 | red color | 2 | oxidizing agents |
| Methylene blue and NaS2 | Se0 | decolorization | 3 | oxidizing agents |
| Ammonium molybdate | Se+4 | molybdenum-selenium blue color | 3 | PO4-3, SO4-2 |
| 3,3 ′- diamino-benzidine | Se+4 | yellow color or red fluorescence | 0.01 | oxidizing agents, Fe+3, Cu +2 |
| 2,3- diamino-naphthalene | Se+4 | yellow color or green fluorescence | 0.002 | oxidizing agents |
SOURCE: Nazarenko and Ermakov (1972)
From: 2, Chemistry
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