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TOTAL HARDNESS KIT
DIRECT READING TITRATOR, 0-200 PPM
CODE 4482-DR-LI-01
QUANTITY CONTENTS CODE
15 mL *Hardness Reagent # 5 *4483-E
15 mL *Hardness Reagent # 6 Solution *4485-E
60 mL Hardness Reagent # 7 4487DR-H
1 Test Tube, 5-10-12.9-15-20-25 mL, glass,
w/cap
1 Direct Reading Titrator, 0-200 Range 0382
1 Pipet. 0.5 mL 0353
0608
*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 specifi ed code number.
NOTE: Carefully read the instruction manual for the LaMotte Direct Reading Titrator
before performing the titration described below. The titrator is calibrated in terms of
Total Hardness expressed as parts per million (ppm) Calcium Carbonate CaCO
. Each
3
minor division on the titrator scale equals 4 ppm CaCO3.
PROCEDURE
1. Fill the test tube (0608) to the 12.9 mL line with the water sample.
2. Add fi ve drops of *Hardness Reagent #5 (4483) and mix.
3. Add fi ve drops of *Hardness Reagent #6 Solution (4485) and mix. Solution will
turn red if hardness is present. If solution is blue, there is no measurable amount
of hardness.
4. Fill the Direct Reading Titrator (0382) with Hardness Reagent #7 (4487DR) in the
manner described in the instruction manual. Insert the titrator in the center hole of
the test tube cap.
5. While gently swirling the tube, slowly press the plunger to titrate the sample until
the red color changes to blue. Read the test result directly from the scale where
the large ring on the Titrator meets the Titrator barrel. The result is expressed as
Total Hardness in ppm CaCO3.
EXAMPLE: Plunger tip is 3 minor divisions below line 80. Test result is 80 plus
(3 divisions x 4) equals 92 ppm.
6. If the plunger tip reaches the bottom line on the titrator scale (200 ppm) before the
endpoint color change occurs, refi ll the titrator and continue the titration. When
recording the test result, be sure to include the value of the original amount of
reagent dispensed (200 ppm).
7. Parts per million CaCO3 test results may be converted to grains per gallon (gpg)
CaCO3 by means of the following formula:gpg CaCO3 = ppm CaCO3 x 0.058
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ANALYSIS OF HARDNESS IN SALT WATER
When sea and estuarine waters containing very high levels of mineral salts are to
be tested, the sample must be diluted to fall within the range of the test kit. This test
set is supplied with a calibrated pipet for performing the simple, convenient dilution
described below.
1. Use the 0.5 mL pipet (0353) to transfer 0.5 mL of the salt water to be tested to the
test tube (0608).
2. Fill the test tube to the 12.9 mL line with distilled water (1:25.8 dilution).
3. Follow Steps 2 through 6. Multiply the resulting titrator reading by 25.8 to obtain
the test result expressed as Total Hardness in ppm CaCO
.
3
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