LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 13)

Field Test Method - Total Hardness
Quantity Contents Code
100 Hardness Reagent #6 Tablets 4484-J
15 mL *Hardness Reagent #5 *4483-E
15 mL *Sodium Hydroxide Reagent w/Metal Inhibitor *4259-E
50 Calcium Hardness Indicator Tablets T-5250-H
30 mL Hardness Reagent #7 4487DR-G
1 Test Tube, 12.9 mL, w/cap 0608
1 Direct Reading Titrator, 0-200 Range 0382
WARNING: Reagents marked with a * are considered to be potential health hazards.
To view or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD
or www.lamotte.com. To obtain a printed copy, contact LaMotte by email, phone or fax.
The Hardness DR Titration Tube (0608) is calibrated so that the hardness
can be read directly from the scale on the Direct Reading Titrator in ppm.
Each minor division on this scale is equal to 4 ppm. Divide this direct
reading by the factor 17.1 to obtain hardness in grains per gallon (gpg).
Read the LaMotte Direct Reading Titrator Manual before proceeding.
Procedure
1. Fill the test tube (0608) to the 12.9 mL line with sample water.
2. Add 5 drops of *Hardness Reagent #5 (4483) and mix. Add 1 Hardness
Reagent #6 Tablet (4484) and swirl to disintegrate the tablet. A red color
will develop.
3. Fill the Direct Reading Titrator (0382) with the Hardness Reagent #7
(4487).
4. Add Hardness Reagent #7 (4487) one drop at a time, swirling to mix
after each drop, until the red color changes to clear blue.
5. Read the test result directly from the scale where the large ring on the
Titrator meets the Titrator barrel. Record as Total Hardness as ppm
Calcium Carbonate.
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