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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
  1. Rows with bold font indicate the optimal condition for the given parameter.