LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 42)

Field Test Method
Quantity Contents Code
60 mL *Chloride Reagent #1 *4504-E
15 mL *Chloride Reagent #2 *4505DR-H†
1 Test Tube, 5-10-15 mL, glass, w/cap 0778
1 Direct Reading Titrator, 0-20 Range 0378
1 Pipet, plain 0352
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 spillage
Read the LaMotte Direct Reading Titrator Manual before proceeding.
Procedure
1. Use the pipet (0352) to add three drops of the sample water to the test
tube (0778).
2. Carefully add chloride-free water until the tube is filled to the 15 mL
line. (This is a one part to one hundred part (1:100) dilution.)
3. Add three drops of the *Chloride Reagent #1 (4504). Cap and mix. A
yellow color will result.
4. Fill the Direct Reading Titrator (0378) with *Chlroide Reagent #2
(4505). Insert the titrator in the center hole of the cap.
5. Add *Chloride Reagent #2 (4505) until the color of the solution
changes from yellow to pinkish-brown. Swirling to mix after each
addition.
6. Read the test result directly from the scale where the large ring on the
Titrator meets the Titrator barrel. Record the result as ppt Salinity. Each
minor division equals 0.4 ppt.
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.
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