LaMotte AST Series Professional Soil Test Outfits - Manual (Page 25)

PROCEDURE
Read Use of the Octa-Slide Viewer on page 5 before proceeding.
1.
Fill the test tube (0701) to the 15 mL line with deionized water.
2. Use the 1.0 g spoon (0697) to add 3 measures of soil.
3. Add 0.5 mL of Charcoal Suspension (5638). Cap and shake for 5
minutes.
4. Use the filter paper (0465) and funnel (0459) to filter sample(see
page 10, How to Use a Funnel and Filter Paper). Collect liquid. Use
this liquid as the extract for the sulfur test.
5. Fill the tube (0106-WL) to the 5 mL line with soil extract. Dilute to
10 mL line with deionized water.
6. Use the 0.1 g spoon (0699) to add 1 measure of *Sulfate Reagent
(V-6277). Cap and shake until the powder is dissolved. A white
precipitate will form if sulfur is present. Wait 5 minutes.
7. Invert the sample once to mix. Insert test tube into the Octa-Slide
Viewer (1100). Place tube in Viewer with printing facing away from
operator. Slide the Sulfur Octa-Slide Bar (3480) into viewer. Match
sample color to a color standard. Record as ppm Sulfur.
NOTE: If sample turbidity is greater than the highest standard, the
sample must be diluted (see Sample Dilution Techniques,
page 7) and the test repeated.
25