LaMotte SMART3 Soil Operator's Manual page 87

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5. Add one Calcium Hardness Indicator Tablet (5250A) to the test sample. Cap and
shake to dissolve the tablet. A red color will develop.
6. Immediately titrate the sample. Fill the Direct Reading Titrator with Standard EDTA
Reagent (5254). Insert the tip of the Titrator into the hole in the cap of the test
tube.
7. While gently shaking the tube, slowly press the plunger to titrate until the red color
changes to a clear blue and does not revert to red upon standing for 1 minute. Read
the test result from the scale where the large ring on the Titrator meets the Titrator
barrel. Multiply by 5.16. This is Titration Value B.
IV. FINAL RESULTS
Calcium Content = 0.4 x Titration Value B = ppm Ca
Magnesium Content = 0.24 (Value A - Value B) = ppm Mg
Multiply the results by 2 to obtain the content in pounds per acre.
EXAMPLE:
Titration Value A is 640 ppm CaCO
Titration Value B is 520 ppm CaCO
Calcium = 0.4 x 520 = 208 ppm Ca
= 208 x 2 = 416 lb/acre Ca
Magnesium = 0.24 (640 - 520)
= 0.24 x 120 = 29 ppm Mg
= 29 x 2 = 58 lb/acre Mg
Smart3 Soil Test Procedures 09.18
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