LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 22)

Overhead Projection Demonstration
Quantity Contents Code
50 *Chlorine DPD #4R Tablets *6899A-H
1 Test Tube, plastic, w/cap 0106
1 Chlorine DPD Comparator, 0.1 and 0.4 ppm 4551
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
Procedure
1. Place the Overhead Projection Stage (1038) on the overhead projector
and turn on the projector light.
2. Fill test tube (0106) to the 5 mL line with sample water twice, and
transfer two tubes full (10 mL) to a cell on the demonstration stage.
Repeat this operation, filling a second cell with 10 mL of water to be
tested. The first cell will be used as a control (nothing more is added to
this cell) and the second cell will be used for the test.
3. Add one *Chlorine DPD #4R Tablet (6899A). Stir the mixture with the
spatula (0691) until the tablet disintegrates.
4. If the chlorine is present in the water sample, a color will develop. The
color may range from very light pink (trace) to a deep pink color that
indicates a high chlorine content.
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