LaMotte pHTestr Spear User Manual
PHOS PHO RUS MOD ULE
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WARNING! This set contains chemicals
that may be harmful if misused. Read
cautions on individual containers
carefully. Not to be used by children
except under adult supervision
CODE 5931
FOR MODEL AM-31 • CODE 5928
QUANTITY CONTENTS CODE
120 mL *Universal Extracting Solution *5173PS-J
120 mL *Universal Extracting Solution *5173PT-J
30 mL *Phosphorus Reagent #2 *5156-G
50 *Phosphorus Test Tablets *5706A-H
1 Pipet, plain, glass, w/cap 0341
1 Filter Paper, 50 pk 0465-H
1 Funnel, plastic 0459
1 Test Tube, 1-8 mL, plastic, w/cap 0755
2 Test Tubes, Phosphorus B, w/caps 0244
1 Test Tube, plastic, filtrate 0749
1 Spoon, 0.5 g 0698
1 Color Chart, Phosphorus 1312
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these
reagents go to www.lamotte.com. To obtain a printed copy, contact LaMotte by
e-mail, phone or fax.
To order individual reagents or test kit components, use the specified code
number.
For a discussion of the importance of phosphorus, read the handbook, A
Study of Soil Science (Code 1530) by Dr. Henry D. Foth.
PRO CE DURE
NOTE: This test is very sensitive to contamination. The work area,
materials and hands should be clean. Avoid exposure to fertilizer dust.
1. Fill a test tube (0755) to line 7 with *Universal Extracting Solution
(5173).
2. Use the 0.5 g spoon (0698) to add four level measures of soil. Cap
tube and shake for one minute.
NOTE: When adding samples with high concentrations of
carbonates to *Universal Extracting Solution (5173), swirl tube to
mix for 30 seconds before capping to allow gases to escape.
3. Fold a piece of filter paper (0465) in half. Fold in half again. Gently
push corners together to form a cone. Place cone in funnel (0459).
4. Place funnel in clean filtrate tube (0749) and filter suspension
through the filter paper. The clear solution is the extract used in the
test.
5. Fill the Phosphorus “B” Tube (0244) to the mark with the soil
extract.
6. Add 6 drops of *Phosphorus Reagent #2 (5156) Swirl to mix.
7. Add one *Phosphorus Test Tablet (5706A). Cap and swirl until the
tablet disintegrates.
8. Remove cap. Hold tube a“ above the white area of the Phosphorus
Color Chart (1312). Looking down through the solution, match
sample color to a color standard. Record as lbs/acre phosphorus. The
color comparison should be done in natural light.
NOTE: Do not allow the solution to stand for more than 10 minutes
before making the color comparison.
LaMOTTE COM PANY
Help ing Peo ple Solve An a lyt i cal Chal lenges
PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
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