LaMotte SMART Spectro Spectrophotometer - Manual (Page 96)

CHLORINE-FREE, UDV
DPD UNIT DOSE VIAL METHOD • CODE 4311-J
QUANTITY CONTENTS CODE
1 *Free Chlorine Unit Dose Vials, 20 pouches *4311-J
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 30528
1 Pipet Tips (0-5 mL) 30695
1 Cuvette Rack 31695
1 Package of 3 Vials (empty) 0156
1 Foil Storage Bag 9467
*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.
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
kill 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.
Chlorine can be added in the form of chlorine gas, liquid sodium hypochlorite
SMART Spectro Test Procedures 2.11 CHLORINE-FREE, UDV
Test P
rocedures