Chemical Oxygen Demand (COD)
www.chemetrics.com | 1-800-356-3072
Methods
References: USEPA Methods for Analysis of
Water and Wastes, Method 410.4 (1983).
APHA Standard Methods, 20
th
ed., pp. 5-17,
Method 5220 D (1998). A. M. Jirka and M. J.
Carter, “Micro Semi-Automated Analysis of Surface and
Wastewaters for Chemical Oxygen Demand,” Analytical
Chemistry, Vol. 47, p.1397 (1975). J. A. Winter, “Method
Research Study 3, Demand Analysis, An Evaluation of
Analytical Methods for Water and Wastewater,” USEPA,
1971. ASTM D 1252-00, Chemical Oxygen Demand
(Dichromate Oxygen Demand) of Water, Test Method B.
The determination of Chemical Oxygen Demand (COD)
is widely used in municipal and industrial laboratories
to measure the overall level of organic contamination
in wastewater. The contamination level is determined by
measuring the equivalent amount of oxygen required to
oxidize organic matter in the sample.
CHEMetrics offers two dichromate reactor digestion
methods for fast, easy, safe determinations of low-,
mid-, and high-range COD levels in wastewater: the
USEPA-approved Method
*
, and a mercury-free method.
The products using the USEPA-approved method
contain mercuric sulfate in the reagent to eliminate
chloride interferences. The more readily disposable
mercury-free product line is applicable when chloride
interference is not a concern and USEPA reporting is
not required.
CHEMetrics’ leakproof reagent vials contain pre-
measured solutions of sulfuric acid and potassium
dichromate. To perform the COD determination, the
analyst simply removes the Teflon-lined screw cap
from the vial, adds sample to the vial, and replaces
the cap. The vial is then heated for two hours at 150
o
C
in a standard digestor block. Once digestion is complet-
ed, results are obtained using any photometer that
accepts 16-mm diameter cells. CHEMetrics COD vials can
be directly used in our V-2000 multi-analyte photometer,
CHEMetrics’ single analyte COD photometers, as well as
in Hach
1
spectrophotometers. Built-in Hach COD meth-
ods and calibrations can be used without the need for a
new calibration. A generic calibration table is included
within the CHEMetrics kit for use with other spectropho-
tometers.
*Contains mercury. Dispose according to local, state or federal laws.
See Product Price List for COD Quantity
Discount Schedule.
1
NOTE: No endorsement by Hach Company is implied
or intended.
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