Lamotte SMART3 Colorimeter User Manual download pdf (Page 117)

CHLORINE

DPD TABLET METHOD • CODE 3643-SC

QUANTITY CONTENTS CODE

100 *DPD #1 Instrument Grade Tablets *6903A-J

100 *DPD #3 Instrument Grade Tablets *6197A-J

15 mL Glycine Solution 6811-E

1 Tablet Crusher 0175

*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 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.

Chlorine can be added in the form of chlorine gas, liquid sodium hypochlorite

(bleach), granular calcium hypochlorite or as organic chlorine compounds.

Chlorine is not present in natural water supplies; if it is present it is the result of

chlorination of a water supply or of chlorinated compounds being discharged as

waste from industrial operations. The presence of chlorine in concentrations above

0.5 parts per million should be considered evidence of pollution from chlorine

treated efﬂ uents or from a process in which high concentrations of chlorine are

used.

SMART3 Test Procedures 11.10 CHLORINE, DPD Tablet

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 117