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

Chlorine Test
Chlorine in the form of chlorine gas, hypochlorite, chloramines and organic
chlorine compounds is widely used for sterilization and disinfection.
Chlorine is not present in natural waters and is found only as a result of
chlorination of a water supply. The presence of any amount more than
would normally be used to sterilize water could be considered evidence of
pollution from chlorine treated effluents from a process in which high
concentrations of chlorine are used.
The most widely used method for detecting chlorine is based on its reaction
with the DPD indicator to produce a pink color.
Field Test Method
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
*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. Fill a 10 mL Test Tube (0106) to the 5 mL line with the sample water.
2. Add 1 *Chlorine DPD #4R Tablet (6899A). Cap tube and invert to
disintegrate tablet.
3. Chlorine is present if a pink color develops. Immediately insert test tube
into Chlorine DPD Comparator (4551). Match sample color to a color
standard. Record as ppm Chlorine.
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