LaMotte OP-DC User Manual

PHOSPHONATE TEST KIT

L

Mott

DIRECT READING TITRATOR METHOD

MODEL FI-DR • CODE 7530-DR

QUANTITY CONTENTS CODE

15 mL *Hydrochloric Acid, 1.0N *6130-E
15 mL *Fluoride Inhibitor *3929-E
15 mL Sodium Thiosulfate, 0.1N 6155-E
10 g Xylenol Orange Powder 6165-D
60 mL Thorium Nitrate Solution 6158PS-H
1 Test Tube, 5-10-15 mL, w/cap 0778
1 Dispenser Cap 0601
1 Spoon, 0.1 g 0699
1 Direct Reading Titrator, 0-20 Range 0378
1 pH paper, 1.3-4.4 2958

*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.

Carefully read the instruction manual for the Direct Reading Titrator before
performing the titration procedure described below. The Titrator is calibrated in
terms of parts per million Phosphonate, and each minor division on the Titrator
scale equals 0.4 ppm.

NOTE: This test has been calibrated for Dequest 2006. When a different
compound is to be tested, the amount of Thorium Nitrate added should be
multiplied by a conversion factors below to determine ppm Phosphonate. If any
other phosphonate compound is used, the factor must be determined
experimentally using standard solutions of that compound.

Phosphonate Compound Name Factor

Dequest 2000 AMP(NTP) 0.8
Dequest 2006 NaAMP 1.0
Dequest 2010 HEDP(A) 0.6
Belcor 575 0.5

PRO CE DURE

For most accurate results, a blank test should be run on a sample of the
water containing no phosphonate. Any result from this blank test should
be subtracted from the result recorded in Step 6.

1. Fill the test tube (0778) to the 10 mL line with sam ple wa ter.

2. Add 1 drop of Sodium Thiosulfate (6155) and 5 drops of *Fluoride

Inhibitor (3929).

3. Use the 0.1 g measuring spoon (0699) to add one level measure of
Xylenol Orange (6165). Swirl to dissolve.

4. Best results are obtained in the pH range 2.5-3.0. This adjustment is
made by adding *Hydrochloric Acid (6130) drop by drop to the
sample and using the pH paper (2958) to test the solution. After each
addition of *Hydrochloric Acid (6130) dip a strip of pH paper, torn
from the roll, into the test solution for 5 seconds. Compare the
resulting color with the color standards on the side of the pH paper
container. Add *Hydrochloric Acid (6130) until the color of the pH
paper matches the pH 2.8 color standard. The sample will be yellow.

5. Replace the regular cap on the bottle of Thorium Nitrate (6158PS)
with the dispenser cap (0601). Fill the Direct Reading Titrator (0378)
with this reagent. Insert the Titrator into the center hole of the
titration tube cap.

NOTE: Replace the regular cap on the Thorium Nitrate bottle for
storage.

6. While gently swirling the titration tube, slowly press the plunger to
titrate until the solution changes from yellow to pink. Read the test
result directly from the scale where the large ring on the Titrator meets
the Titrator barrel. Record the result in ppm phosophonate.

LaMOTTE COM PANY

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PO Box 329 • Chestertown • Mary land • 21620 • USA

800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax [phone]

Visit us on the web at www.lamotte.com

SM

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