LaMotte AST Series Professional Soil Test Outfits - Manual (Page 5)

TEST METHODS
pH, Nitrate Nitrogen, Ammonia Nitrogen, Nitrite Nitrogen,
Phosphorus, Iron, and Sulfur test results are determined using an
Octa-Slide Viewer. In this method, the color or turbidity of the reacted
sample is matched to plastic color standards mounted in a black color
bar.
The Octa-Slide Viewer should be held so
non-direct light enters through the back of the
viewer. With sample tube inserted at top, slide
the Octa-Slide bar through the viewer and
match with color standard.
Humus, Aluminum and Manganese test results
are determined using a color chart. After the
reaction is performed on a spot plate, the
resulting color is matched to a printed color
standard on a laminated chart.
The Copper test result is determined by a simple drop count. A standard
solution is added a drop at a time to an unreacted sample until it
matches the color of a reacted sample.
The Potassium test uses a Double Tube to measure the turbidity of the
sample formed by the reacted potassium.
Calcium, Magnesium, and Chloride test results are determined using a
Direct Reading Titrator, where small amounts of a titrant are added to
the sample until a specified color change occurs.
USE OF THE DIRECT READING TITRATOR
The Direct Reading Titrator consists of a plastic barrel, a plastic plunger,
and a plastic adapter tip. The adapter tip reduces the size of the drops
that are dispensed, increasing the precision of the test results. Detailed
instructions for the use of the Direct Reading Titrator are provided on
page 6.
see next page
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L Mott