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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.