Table 1 Different conditions tested for optimization of digestion procedure for 0.5 g ginger samples
From: Levels of essential and non-essential metals in ginger (Zingiber officinale) cultivated in Ethiopia
Trial no. | Reagent(s) used | Reagent volume (mL) | Temp. (°C) | Digestion time (h) | Results |
|---|---|---|---|---|---|
Optimization for reagent volume | |||||
1 | HNO3:HClO4 | 3:3 | 270 | 3:00 | Deep yellow |
2 | HNO3:HClO4 | 4:2 | 270 | 3:00 | Yellow |
3 | HNO3:HClO4 | 3:2 | 270 | 3:00 | Clear yellow |
4 | HNO3:HClO4 | 4:1 | 270 | 3:00 | Almost clear |
5 | HNO3:HClO4 | 2:2 | 270 | 3:00 | Clear light yellow |
6 | HNO 3 :HClO 4 | 3:1 | 270 | 3:00 | Clear and colourless |
Optimization for temperature | |||||
1 | HNO3:HClO4 | 3:1 | 150 | 3:00 | Deep yellow |
2 | HNO3:HClO4 | 3:1 | 180 | 3:00 | Light yellow |
3 | HNO 3 :HClO 4 | 3:1 | 210 | 3:00 | Clear and colourless |
4 | HNO3:HClO4 | 3:1 | 240 | 3:00 | Clear and colourless |
5 | HNO3:HClO4 | 3:1 | 270 | 3:00 | Clear and colourless |
6 | HNO3:HClO4 | 3:1 | 300 | 3:00 | Clear and colourless |
Optimization for digestion time | |||||
1 | HNO3:HClO4 | 3:1 | 210 | 1:45 | Deep yellow |
2 | HNO3:HClO4 | 3:1 | 210 | 2:00 | Light yellow |
3 | HNO3:HClO4 | 3:1 | 210 | 2:15 | Light yellow |
4 | HNO3:HClO4 | 3:1 | 210 | 2:30 | Clear light yellow |
5 | HNO3:HClO4 | 3:1 | 210 | 2:45 | Clear and colourless |
6 | HNO 3 :HClO 4 | 3:1 | 210 | 3:00 | Clear and colourless |