LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 20)

Field Test Method
Quantity Contents Code
15 mL *Chloride Reagent #1 *4504-E
60 mL *Chloride Reagent #2 *4505DR-H†
1 Test Tube, 5-10-15 mL, glass, w/cap 0778
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.
† Chloride Reagent #2 (4505DR)contains Silver Nitrate, which will cause a dark
stain where it contacts the skin. Care should be taken to avoid spilling.
Read the LaMotte Direct Reading Titrator Manual before proceeding.
Fill the test tube (0778) to 15 mL line so that the result may be read directly
from the scale on the Direct Reading Titrator in ppm Chloride. Each minor
division on the scale is equal to 4 ppm chloride. The chloride content in
grains per gallon (gpg) may be obtained by dividing the titrator reading by a
factor of 17.1.
Procedure
1. Fill the test tube (0778) to the 15 mL line with sample water.
2. Add three drops of *Chloride Reagent #1 (4504). Cap and swirl to mix.
A yellow color will result.
3. Fill the Direct Reading Titrator (0382) with *Chloride Reagent #2
(4504). Insert the titrator in the center hole of the cap.
4. Add the *Chloride Reagent #2 (4505) until the yellow color is
permanently changed to pinkish-brown.
5. Read the test result directly from the scale where the large ring on the
Titrator meets the Titrator barrel. Read the result as ppm Chloride.
Overhead Projection Demonstration
The reaction of the Chloride-Salinity test procedure does not work
satisfactorily on the overhead projector. A precipitate is formed in this
reaction. This precipitate blocks out the passage of light through the cell and
a blank circle is projected.
20