Manganese

LaMotte Manganese Test

 

1. Fill a tube with a 7  mL line with Universal Extracting solution consisted of 3% acetic acid, 10% sodium acetate, deionized water to the remaining percent.

2. Use the plastic soil measurer (1 cc soil scoop) to add two level measures of the soil sample.

3. Use a piece of qualitative filter paper (folded in half twice to form a cone which is then fitted snuggly into the funnel with one piece on one side of the funnel and 3 pieces of the paper on the other side of the plastic funnel) to filter the soil suspension into a second extraction tube.

4. The filtrate in the second extraction tube is the general soil extract.

5. Use a transfer pipette to add 10 drops of soil extract to the large depression on a spot plate.

6. Use the 0.05 g spoon to add one measure of Manganese Buffer Reagent consisted of 27% citric acid, 73% sodium phosphate.

7. Mix with a clean stirring rod until the powder dissolves.

8. Use the other .05 g spoon to add one measure of Manganese Periodate Reagent consisted of 10-50% sodium meta periodate, 50-90% sodium sulfate.

9. Mix with a clean stirring rod for 20 seconds.

10. Match the color in the spot plate to a color standard on the Manganese in soil color chart.

11. Record the manganese in ppm. according to the following conversions:

                    None= 0

                    Very low=5

                                                                  Low=10

                                                                  Medium= 25

                                                                  High= 80

                                                                  Very High= 150

 

LaMotte  

 LaMotte Ferric Iron Test

 

1. Fill a tube with a 14 mL line with Universal Extracting solution consisted of 3% acetic acid, 10% sodium acetate, deionized water to the remaining percent.

2. Use the plastic soil measurer (1 cc soil scoop) to add two level measures of the soil sample.

3. Cap and shake for one minute.

4. Use a piece of qualitative filter paper (folded in half twice to form a cone which is then fitted snuggly into the funnel with one piece on one side of the funnel and 3 pieces of the paper on the other side of the plastic funnel) to filter the soil suspension into a second extraction tube.

5. The filtrate in the second extraction tube is the general soil extract.

6. Use a transfer pipet to transfer four drops of the general soil extract to one of the larger depressions on a spot plate.

7. Use the .05g spoon to add one level measure of Iron Reagent powder consisted of 100% sulfamic acid.

8. Mix with a clean stirring rod.

9. Add one drop of Ferric Iron test solution consisted of 10% potassium thiocyanate, and deionized water for the remaining percetage. Mix again.

10. Match the resulting color to the Ferric Iron color chart. The test result is read in pounds per acre ferric iron.

11. Record the ferric iron results in ppm. Convert from ppa to ppm by dividing the results by 2.

 

 

 

 

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