Test Procedures
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 Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the contents
list or in the test procedures. Omit any letter that follows or precedes the four digit code
number. For example, if the code is 4450WT-H, search 4450. To obtain a printed copy,
contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
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 eff ected by temperature and salinity.
APPLICATION:
Drinking and surface waters; domestic and industrial
wastewaters.
RANGE:
0.00–12.00 ppm Dissolved Oxygen
MDL:
0.25 ppm
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.
SMART Spectro 2 Test Procedures 05.02.16
DISSOLVED OXYGEN
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