LaMotte SMART3 Colorimeter - Manual (Page 121)

CHLORINE, FREE - UDV
DPD METHOD–UNIT DOSE VIALS · CODE 4311-J
QUANTITY CONTENTS CODE
1 *Free Chlorine Unit Dose Vials, 20 pouches *4311-J
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents
go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,
phone or fax.
Equipment needed but not supplied:
STANDARD ACCESSORY PACKAGE · CODE 1961
1
Package of 3 Vials (empty) 0156
1 Syringe, 3 mL, plastic 1184
1 Foil Storage Bag 9467
Or:
ADVANCED ACCESSORY PACKAGE · CODE 1962
1
Pipettor, 3mL 30528
1 Pipet Tip (0-5 mL) 30695
1 Cuvette Rack 31695
1 Package of 3 Vials (empty) 0156
1 Foil Storage Bag 9467
All water for cities and communities must be sanitized; even waters that come from
clean sources, protected watersheds, reservoirs, and deep wells, are commonly
sanitized to assure safety. Chlorine is the most commonly used sanitizer for several
reasons: it is effective against a wide range of microorganisms, the cost is low, and
the methods of applying it have been well developed. If an adequate concentration
of chlorine is present in the water for a few minutes, disease producing bacteria
will be destroyed. A number of conditions affect the sanitizing action of chlorine.
In municipal systems these can be controlled so that if chlorine is detectable, it
can be assumed that bacteria have been killed. The factors that infl uence the rate
of sanitization are temperature, pH, presence of other materials that react with
chlorine, time, and the concentrations of the various chlorine combinations that are
formed in the water with ammonia and other substances that react with chlorine.
The fact that chlorine can be easily detected and measured makes chlorine a
favorite water sanitizer of those concerned with the public safety of water supplies.
Chlorine concentrations in the range of 0.1 to 0.4 parts per million are usually
maintained in municipal supplies.
SMART3 Test Procedures 11.10 CHLORINE, Free, UDV
Test P
rocedures