97
OXYGEN DEMAND, CHEMICAL MEDIUM RANGE
SPECIFICATIONS
Range
0 to 1500 mg/L COD
Resolution
1 mg/L
Accuracy
±22 @ 1000 mg/L
Typical EMC
±1 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 610 nm
Method
Adaptation of the USEPA 410.4 approved method for the COD determination on
surface waters and wastewaters. Oxidizable organic compounds reduce the dichromate
ion (orange) to the chromic ion (green). The amount of chromic ion formed is
determined.
REQUIRED REAGENTS
Description
Q.ty/test
Q.ty/set
Reagent Vial
1 vial
25 vials
Deionized Water
2.0 mL
optional
Note
: Store the unused vials in their container in a cool and dark place.
REAGENT SET
HI 93754B-25
Reagents for up to 25 tests
REQUIRED ACCESSORIES
HI 839800-01
Hanna reactor (115 VAC)
HI 839800-02
Hanna reactor (230 VAC)
HI 740216
Test tube cooling rack (25 holes)
HI 740217
Laboratory bench safety shield
For other accessories see page 132.
MEASUREMENT PROCEDURE
Before using the reagent kit carefully read all the instructions and the Manual Safety Data
Sheet (MSDS). Pay particular attention to all warnings, cautions and notes. Failure to do so
may result in serious injury to the operator.
Reagent Blank Correction
: This method requires a reagent blank correction. A single blank vial may be used
more than once. The blank vial is stable for several months (room temperature). For most accurate measurement,
run a blank for each set of measurements and always use the same lot of reagents for blank and samples.