LaMotte SMART 3 Electronic Soil Lab - Manual (Page 64)

64 SMART3 Soil 1.11
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.
Fill a clean test tube (0701) to the 15 mL line with deionized water. 1.
Add 3 measures of soil using the 1 g spoon (0697). Cap tube and shake for 2.
five minutes.
Filter and collect all of the soil filtrate using the funnel (0459) and filter paper
3.
(0463). The extract does not have to be clear since a slight turbidity does
not interfere in the test.
Fill the test tube (0778) to the 10 mL line with the filtrate.
4.
Add three drops of *Chloride Reagent #1 (4504) to the sample. Cap and 5.
shake to mix. A yellow color will result.
Fill the Direct Reading Titrator (0384) with *Silver Nitrate, 0.141 (3062DR) in
6.
the manner described in the instruction manual.
Titrate the test sample with *Silver Nitrate, 0.141 (3062DR) until the yellow
7.
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, refill the Titrator and continue the titration
procedure. Be sure to include the value of the original amount added (1000
ppm) when recording the final result.
Test P
rocedures