LaMotte SMART3 Soil Operator's Manual page 89

PROCEDURE
Carefully read the LaMotte Direct Reading Titrator Manual (1649) before performing
the titration procedure described below. The Titrator is calibrated in terms of parts per
million chloride and each minor division on the Titrator scale equals 20 ppm.
1. Fill a clean test tube (0701) to the 15 mL line with deionized water.
2. Add 3 measures of soil using the 1 g spoon (0697). Cap tube and shake for fi ve
3. Filter and collect all of the soil fi ltrate using the funnel (0459) and fi lter paper
4. Fill the test tube (0778) to the 10 mL line with the fi ltrate.
5. Add three drops of *Chloride Reagent #1 (4504) to the sample. Cap and shake to
6. Fill the Direct Reading Titrator (0384) with *Silver Nitrate, 0.141 (3062DR) in the
7.
CHLORIDE
1.800.544.2843
minutes.
(0463). The extract does not have to be clear since a slight turbidity does not
interfere in the test.
mix. A yellow color will result.
manner described in the instruction manual.
Titrate the test sample with *Silver Nitrate, 0.141 (3062DR) until the yellow color
changes permanently to pink. Read the test result from the scale where the large
ring on the Titrator meets the Titrator barrel. If the plunger reaches the bottom
mark (1000 ppm) on the Titrator scale before the endpoint color change occurs,
refi ll the Titrator and continue the titration procedure. Be sure to include the value
of the original amount added (1000 ppm) when recording the fi nal result.
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Smart3 Soil Test Procedures 9.18
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