LaMotte CALCIUM HARDNESS FOR FRESH OR SALT WATER CA-DR User Manual

CAL CIUM HARD NESS FOR

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

FRESH OR SALT WA TER

MODEL CA-DR • CODE 3609

QUANTITY CONTENTS CODE

15 mL *Sodium Hydroxide Reagent

w/Metal Inhibitors 50 Calcium Hardness Indicator Tablets T-5250-H 60 mL Hardness #7 Reagent 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, plastic 0353

*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 a complete set of refill reagents, order as R-3609. To order individual reagents or test kit components, use the specified code number.

NOTE: Read the LaMotte Direct Reading Titrator Instruction Manual before proceeding. The Titrator is calibrated in terms of hardness expressed as parts per million (ppm) calcium carbonate (CaCO3). Each minor division on the Titrator scale equals 4 ppm CaCO3.

PRO CE DURE

CALCIUM HARDNESS (FRESH WATER)

1. Fill test tube (0608) to 12.9 mL line with sample water.

2. Add 6 drops of * Sodium Hydroxide Reagent w/Metal Inhibitors (4259).

Cap and mix.

3. Add one Calcium Hardness Indicator Tablet (T-5250). Cap and gently

mix until tablet disintegrates. 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). Insert into the center hole of the test tube cap.

*4259-E

0608

5. While gently swirling the tube, slowly depress the plunger to titrate the

sample until the red color changes to purple then to blue. Read the test result directly from the scale where the large ring on the Titrator meets the Titrator barrel. Record as ppm Calcium Hardness as CaCO3.

NOTE: Disregard any color change back to purple after five seconds. EXAMPLE: Large ring is 3 minor divisions below line 80. Test result is

80 plus (3 divisions x 4) equals 92 ppm.

6. If the plunger reaches the bottom line on the Titrator scale (200 ppm)

before the endpoint color change occurs, refill 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).

ANAL Y SIS OF HARD NESS IN SALT WA TER

When sea and estuarine waters containing very high levels of mineral salts are to be tested, the sample must be diluted before titration.

CALCIUM HARDNESS DILUTION (1 TO 12.9)

1. Use the 0.5 mL pipet (0353) to transfer 1.0 mL (two measures) of the salt

water sample to the test tube (0608).

2. Dilute to 12.9 mL line with distilled water.

3. Add 6 drops of *Sodium Hydroxide Reagent w/Metal Inhibitors (4259).

Cap and mix.

4. Add one Calcium Hardness Indicator Tablet (T-5250). Cap and gently

mix until tablet disintegrates. Solution will turn red.

5. Fill the Direct Reading Titrator (0382) with Hardness Reagent #7

(4487DR). Insert into the center hole of the test tube cap.

6. While gently swirling the tube, slowly depress the plunger to titrate the

sample until the red color changes to purple then to blue. Read the test result directly from the scale where the large ring on the Titrator meets the Titrator barrel. Multiply by 5.16. Record as ppm Calcium as Ca++.

NOTE: Disregard any color change back to purple after five seconds. EXAMPLE: Large ring is 3 minor divisions below line 80. Titrator

reading is 80 plus (3 divisions x 4) equals 92. Multiply by 5.16. Test result is 474.72.

7. If the plunger reaches the bottom line on the Titrator scale (200 ppm)

before the endpoint color change occurs, refill 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).

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