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Table 2 Different conditions tested for optimization of digestion procedure for 0.5 g soil 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 Aqua-regia:H2O2 6.5:1 300 3:00 Deep yellow with suspension
2 Aqua-regia:H 2 O 2 6:1.5 300 3:00 Light yellow with no suspension
3 Aqua-regia:H2O2 5.5:2 300 3:00 Light yellow with no suspension
Optimization for temperature
1 Aqua-regia:H2O2 6:1.5 240 3:00 Deep yellow with suspension
2 Aqua-regia:H 2 O 2 6:1.5 270 3:00 Light yellow with no suspension
3 Aqua-regia:H2O2 6:1.5 300 3:00 Light yellow with no suspension
Optimization for digestion time
1 Aqua-regia:H2O2 6:1.5 270 2:00 Deep Yellow with suspension
2 Aqua-regia:H2O2 6:1.5 270 2:30 Light yellow with suspension
3 Aqua-regia:H 2 O 2 6:1.5 270 3:00 Light yellow with no suspension
  1. Rows with bold font indicate the optimal condition for the given parameter.