LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 9)

Overhead Projection Demonstration
Quantity Contents Code
100 Phenolphthalein Tablets T-2246-J
15 mL Total Alkalinity Indicator 2786-E
30 mL *Alkalinity Titration Reagent B *4493
1 Test Tube, 5-10-15 mL, glass, w/cap 0778
1 Direct Reading Titrator, 0-100 Range 0381
1 Demonstration Stage, six cell 1038
1 Spatula 0691
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.
Read the LaMotte Direct Reading Titrator Manual before proceeding.
Procedure
1. Place the demonstration stage (1038) on the overhead projector and
turn on the projector light.
2. Fill the test tube (0778) to the 10 mL line with sample water and transfer
to a cell on the demonstration stage (1038). (A second cell can be filled
with an identical amount of water sample to be used as a “before” color
standard. Add the indicator in Step 3, but do not titrate.)
3. Add three drops of Total Alkalinity Indicator (2786) and gently stir the
contents of the cell with spatula (0691). If there is any alkalinity present,
a blue-green color will appear.
4. Fill the Direct Reading Titrator (0381) with *Alkalinity Titration
Reagent B (4493).
5. The titrator is held by hand over the cell. Discharge one drop of the
reagent at a time. Stir the mixture after each addition of the titration
solution.
6. When the color of the liquid in the cell changes permanently to pink,
read the test result directly from the scale where the large ring on the
Titrator meets the Titrator barrel. Each minor division equals 2 ppm
CaCO
3
Alkalinity. This value is the “T” Alkalinity. To determine the
“P” Alkalinity, use the procedure described in the field test method on
page 6.
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