PO TAS SIUM MOD ULE
L
Mott
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 5932
FOR MODEL AM-31 • CODE 5928
QUANTITY CONTENTS CODE
120 mL *Universal Extracting Solution *5173PT-J
120 mL *Universal Extracting Solution *5173PS-J
50 *Potassium Reagent B Tablets *5161-H
120 mL *Potassium Reagent C *5162-J
1 Test Tube, Potash “B” 0246
4 Test Tubes, 1-8 mL, plastic, w/cap 0755
1 Funnel, plastic 0459
1 Filter Paper, 50 pk 0465-H
1 Pipet, plastic 0364
1 Spoon, 0.5 g 0698
1 Potash Reading Plate 1107
1 Test Tube, filtrate, plastic 0749
1 Dispenser Cap 0692
*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 potassium, see A Study of Soil Science
(Code 1530) by Dr. Henry D. Foth.
NOTE: It is important the temperature of the test sample and the
*Potassium Reagent C be kept between of 20-27°C (68-80°F) during the
test, in order to ensure complete precipitation of the potassium. On warm
days the vial containing the test solution to which the *Potassium
Reagent B Tablet has been added and the *Potassium Reagent C should
be cooled by placing them in cool water before mixing.
Place dis penser cap (0692) on *Po tas sium Re agent C (5162). Save this
cap for re fill re agents.
PRO CE DURE
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 a clean test tube (0755) to line 3 with soil extract.
6. Add one *Potassium Reagent B Tablet (5161). Cap and shake until
tablet disintegrates.
7. Add *Potassium Reagent C (5162) to line 7. Allow it to run slowly down
the side of the tube. Cap and mix gently. A precipitate will form if
potassium is present.
8. Place a Potash Tube “B” (0246) on the Potash Reading Plate (1107)
directly over the black line.
NOTE: Face a window or some other source of daylight.
9. Use a pipet (0364) to add the treated test sample slowly to Tube “B”
allowing it to run down the sides of the tube while observing the black
line through the solution. Continue until the line just disappears.
10. The height of the column of test sample is measured against the
potassium scale on the tube. Record as pounds per acre potassium.
NOTE: For extremely high readings, dilute the filtered extract and
retest. Add the soil sample filtrate to line 3 of a clean test tube (0755).
Dilute to line 6 with *Universal Extracting Solution (5173). Test
following the procedure beginning with Step 5. Multiply final reading by
2.
PRECAUTION: Large amounts of ammonium salts will produce a
precipitate similar to that obtained with potassium. If fertilizer containing
ammonium salts has recently been added to the soil, or if the soil pH is
low (pH 4.0-5.0), a test should be made for ammonium compounds.
Equivalent quantities of ammonium salts will produce about one-fourth as
much precipitate as obtained from potassium salts.
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
SM
3.11
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