LaMotte SMART3 Soil Operator's Manual page 86

RANGE:
METHOD:
INTERFERENCE:
PROCEDURE
I. DILUTION OF SOIL EXTRACT
Use the 30 mL graduated cylinder (0418) to measure 10 mL of the soil extract and
transfer it to a 50 mL beaker (0944). Add 10 mL of deionized water, mix and neutralize
according to the procedure on page 84.
II. TITRATION A, CALCIUM & MAGNESIUM
Carefully read the LaMotte Direct Reading Titrator Manual (1649) before performing the
titrations described below.
1. Fill the test tube (0778) to the 5 mL line with the soil extract from above. Dilute to
2. Add 5 drops of Calcium Magnesium Inhibitor Reagent (3922).
3. Wait 5 minutes.
4. Use a pipet (0364) to add 5 drops of *Calcium & Magnesium Buff er (5126).
5. Add 10 drops of *CM Indicator (6522WT).
6. Fill the Direct Reading Titrator (0384) with the Standard EDTA Reagent (5254).
7.
8. Read the test result from the scale where the large ring on the Titrator meets the
III. TITRATION B, CALCIUM
1. Fill the test tube (0778) to the 5 mL line with the diluted soil extract. Dilute to 10
2. Add 2 drops of *Inhibitor Solution (9258).
3. Add 2 drops of *Triethanolamine Reagent (3921).
4. Add 8 drops of *Sodium Hydroxide w/Metal Inhibitors (4259).
CALCIUM & MAGNESIUM
1.800.544.2843
0-4000 lb/acre Calcium
0-2400 lb/acre Magnesium
Titration with Schwarzenbach EDTA
Sample color and turbidity may interfere with endpoint.
the 10 mL line with deionized water.
Insert the tip of the Titrator into the center hole of the test tube cap.
While gently swirling the tube, slowly press the plunger to titrate until the color
changes from red to blue and does not revert to red upon standing for 1 minute.
Titrator barrel. Multiply by 5.16. This is Titration Value A.
mL with deionized water.
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Smart3 Soil Test Procedures 09.18
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