LaMotte AST Series Professional Soil Test Outfits - Manual (Page 6)

1. Fill the test tube to the specified line with the water sample.
2. Add the reagents as specified in the instructions for the individual
test method. Cap the tube with the special test tube cap. Mix by
swirling gently.
3. Depress the plunger of the Titrator to expel air.
4. Insert the adapter tip into the special plastic plug in the titrating
solution bottle.
5. Invert the bottle. Hold the bottle and the Titrator firmly together.
Slowly pull out the plunger until the large ring on the plunger is
opposite the zero (0) line on the scale.
6. If an air bubble appears in the Titrator barrel or the adapter tip,
partially fill the barrel and pump the titration solution back into the
inverted reagent bottle to expel the bubble. Repeat this pumping
action until the bubble disappears.
7. Turn the bottle right-side-up and remove the Titrator.
8. Insert the adapter tip into the opening in the test tube cap. Slowly
depress the plunger to dispense the titrating solution. Gently swirl
tube to mix.
9. Continue adding the titrating solution
until the specified color change occurs. If
the color change has not occurred when
plunger reaches the bottom of the scale,
refill the Titrator to the zero (0) line.
Continue the titration until the color
change occurs.
10. Read the test result directly from the scale
where the large ring on the plunger meets
the Titrator barrel. If the Titrator was
refilled to reach the final color change, add the total amounts of
titrant used to determine the final test result.
11. If no additional tests are to be made, discard the titrating solution in
the Titrator. DO NOT return the titrating solution to the reagent
bottle. Thoroughly rinse the Titrator and the titration tube. DO
NOT remove the plunger or the adapter tip from the Titrator.
6
50
60
Result:
50 ppm
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Barrel Plunger Adapter tip