Table 1 Reagent volume, temperature and time attempted during optimization of digestion of 0.5Â g of teff sample
Volume of reagent (mL) | T (oC) | Time (h) | Observation | |
|---|---|---|---|---|
HNO3 | HCLO4 | Â | Â | Â |
5 | 1 | 160 | 2:00 | Dried residue |
3 | 3 | 160 | 2:00 | Clear and colourless solution* |
4 | 2 | 160 | 2:00 | Yellowish precipitate |
2 | 4 | 160 | 2:00 | Cloud yellow |
1 | 5 | 160 | 2:00 | Slightly colourless |