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Dissolved oxygen – LaMotte SMART3 Colorimeter User Manual

Page 173

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DISSOLVED OXYGEN

WINKLER COLORIMETRIC METHOD • CODE 3688-SC

QUANTITY

CONTENTS

CODE

30 mL

*Manganese Sulfate Solution

*4167-G

30 mL

*Alkaline Potassium Iodide Azide

*7166-G

30 mL

*Sulfuric Acid 1:1

*6141WT-G

1

Sample Tube, screw cap

29180

1

Cap

28570

*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.

Dissolved oxygen is vital to the survival of aquatic organisms. Naturally present,

dissolved oxygen enters the water when plants photosynthesize. Wind and wave

action also cause oxygen from the air to dissolve into water. Dissolved oxygen is

consumed by aquatic animals and by the oxidation, or chemical breakdown, of

dead and decaying plants and animals. The concentration of dissolved oxygen

in natural waters can range from 0 to 14 ppm and is effected by temperature and

salinity.

APPLICATION:

This method is applicable for the determination of

dissolved oxygen in drinking water, all surface waters and

wastewater.

MDL: 0.6

ppm

RANGE:

0.0–10.0 Dissolved Oxygen

METHOD:

This method uses the azide modifi cation of the Winkler

Method with a colorimetric determination of the yellow

iodine produced from the reaction with the dissolved

oxygen.

INTERFERENCES:

The presence of other oxidizing agents may cause

positive interferences. Reducing may cause negative

interferences. Nitrite interferences are eliminated with the

azide modifi cation.

SMART3 Test Procedures 11.10

DISSOLVED OXYGEN

Test P

rocedures