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Table 3 Reagent types and volumes, temperature and time attempted during optimization of digestion of 0.5 g soil

From: Levels of major and trace elements in fennel (Foeniculum vulgari Mill.) fruits cultivated in Ethiopia

No.

Reagent volume (mL)

Temperature (°C)

Time (min)

Results

 

HNO3

HClO4

H2O2

   

1

2.2

4.4

1

300

180

Deep yellow with suspension

2

2

4

1.5

300

180

Light yellow with no suspension

3

1.8

3.6

2

300

180

Light yellow with no suspension

4

2

4

1.5

240

180

Deep yellow with suspension

5

2

4

1.5

270

180

Light yellow with no suspension

6

2

4

1.5

300

180

Light yellow with no suspension

7

2

4

1.5

270

120

Deep Yellow with suspension

8

2

4

1.5

270

150

Light yellow with suspension

9

2

4

1.5

270

180

Light yellow with no suspension

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