LaMotte DR-C User Manual

CHLO RIDE TEST KIT

EPA

COMPLIANTCOMPLIANT

DIRECT READING TITRATOR METHOD

MODEL DR-C • CODE 3468

QUANTITY CONTENTS CODE

15 mL *Chloride Reagent A *4069-E
60 mL *Chloride Reagent B *4070-H
1 Test Tube, 5-10-15 mL, glass, w/cap 0778
1 Direct Reading Titrator, 0-50 Range 0380

*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 LaMotte Direct Reading Titrator Manual before
performing the titration. The Titrator is calibrated in parts per million
(ppm chloride). Each minor division on the titrator scale equals 1 ppm.

NOTES:

• If sample is colored, add 0.3 mL Aluminum Hydroxide Suspension
(order LaMotte Code 3826) per 10 mL of sample. Mix, let settle and
filter.

• If sulfide, sulfite or thiosulfate is present, add 0.1 mL Hydrogen
Peroxide 30%, per 10 mL of sample.

EPA AC CEPTED PROCEDURE

To qualify as an EPA accepted test, and to achieve greatest accuracy, the
*Chloride Reagent B should be checked periodically. Refer to Standard
Methods, 16th edition, 407A, 1985.

Standardize against 0.0141N NaCl by adding 3.0 mL of 0.0141N NaCl to
an Erlenmeyer flask. Add 3 to 4 drops of *Chloride Reagent A and titrate
with *Chloride Reagent B to a pinkish yellow endpoint. At the endpoint,

3.0 mL of *Chloride Reagent B should be consumed. Should a variance

greater than 0.3 mL occur, discard *Chloride Reagent B and reorder fresh
reagent(Code 4070).

PRO CE DURE

1. Fill test tube (0778) to 10 mL line with sample water.

2. Adjust pH to read between 7 and 10 using a pH meter or Indicator

Sticks to determine pH.

3. Add three drops of *Chloride Reagent A (4069). Cap and swirl to

mix. A yellow color will develop.

4. Fill Direct Reading Titrator (0380) with *Chloride Reagent B

(4070). Insert Titrator into center hole of test tube cap.

5. While gently swirling tube, slowly press plunger until yellow color

changes to orangish brown. Read test result in ppm Chloride where
plunger tip meets titrator scale.

6. If plunger tip reaches the bottom line on titrator scale (50 ppm)

before color change occurs, refill Titrator and continue titration.
When recording test result, be sure to include original amount of
reagent dispensed (50 ppm).

7. Parts per million chloride test result may be converted to grains per

gallon (gpg) Chloride:

gpg Chloride = ppm Chloride x 0.058