LaMotte SMART 2 Electronic Soil Lab - Manual (Page 34)

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CALIBRATING LaMOTTE PRE-PROGRAMMED TESTS
The LaMotte Pre-Programmed Tests have been pre-calibrated. Recalibration of
the pre-programmed tests by the user is not possible. However, a procedure to
standardize the calibration can be performed to obtain the most accurate
readings or to meet regulatory requirements.
The LaMotte Pre-Programmed tests are standardized with one standard
solution. To standardize over the full range of the test, the concentration of the
standard should be chosen from the high end of the range. Alternatively, if
samples do not cover the full range of the test, a standard should be chosen
that is close to the concentration of the samples.
For the SMART 2 Soil colorimeter, the standard should be prepared in distilled
or deionized water for the range of the reagent system before the multiplication
factor has been applied to the reading on the display. The following standards
are recommended to standardize over the full range of the tests:
Ammonia Nitrogen 3.00 ppm Ammonia Nitrogen
Copper 4.00 ppm Copper
Iron 4.00 ppm Iron
Manganese 11.00 ppm Manganese
Nitrate Nitrogen 2.00 ppm Nitrate Nitrogen
Nitrite Nitrogen 0.60 ppm Nitrite Nitrogen
Phosphorus 2.00 ppm Phosphate
Potassium 7.00 ppm Potassium
Sulfur 75 ppm Sulfate
Zinc 2.00 ppm Zinc
The standardization procedure should be followed as often as required by
regulations and laws for compliance monitoring.
In the example below the Aluminum calibration will be standardized.
Prepare a standard solution to be tested. Use 0.10 ppm aluminum.
Use the
s or t button to scroll to 002 Aluminum.
Follow instructions in the SMART2 Manual for
testing the aluminum standard. Scan the blank.
002 Aluminum
SEQUENCE 3
* Scan Blank
Continued...
34 SMART2 SOIL MANUAL 1.07