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Chemical Oxygen Demand (COD) |
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 Methods
References: USEPA Methods for Analysis of Water and Wastes, Method 410.4 (1983). APHA Standard Methods, 21st ed., Method 5220 D (2005). 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 premeasured 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 the required temperature in a standard digestor block. Once digestion is completed, 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 spectrophotometers. Built-in Hach COD methods 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 spectrophotometers.
NOTE: No endorsement by Hach Company is implied or intended.
Note
*Contains mercury. Dispose according to local. state, or federal laws.
All COD Kits require the use of a Digestor Block and the V-2000 Photometer, a COD Photometer, or a spectrophotometer capable of accepting a 16mm round cell. Instruments sold separately.
A fresh reagent ampoule blank must be prepared for each series of tests; therefore the number of samples that can be tested with each kit will vary.
If no shelf-life is listed for a product, then the shelf-life is at least 2 years. |
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| • Click to View MSDS and Kit instructions |
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 Instrumental Kits |
0-150 ppm
Dichromate Reactor Digestion |
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Cat# |
| COD (USEPA Approved) Vials Kit |
*K-7350S |
| | Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials, instruction book with MSDS and calibration tables. | |
| | COD (USEPA Approved) Vials Kit | *K-7355 |
| | Kit comes in a cardboard box and contains everything needed to perform up to 149 tests (except distilled water): 150 vials, instruction book with MSDS and calibration tables. | |
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0-150 ppm
Dichromate Reactor Digestion |
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Cat# |
| COD (Mercury Free) Vials Kit |
K-7351S |
| | Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials, instruction book with MSDS and calibration tables. | |
| | COD (Mercury Free) Vials Kit | K-7356 |
| | Kit comes in a cardboard box and contains everything needed to perform up to 149 tests (except distilled water): 150 vials, instruction book with MSDS and calibration tables. | |
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0-1500 ppm
Dichromate Reactor Digestion |
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Cat# |
| COD (USEPA Approved) Vials Kit |
*K-7360S |
| | Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials, instruction book with MSDS and calibration tables. | |
| | COD (USEPA Approved) Vials Kit | *K-7365 |
| | Kit comes in a cardboard box and contains everything needed to perform up to 149 tests (except distilled water): 150 vials, instruction book with MSDS and calibration tables. | |
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0-1500 ppm
Dichromate Reactor Digestion |
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Cat# |
| COD (Mercury Free) Vials Kit |
K-7361S |
| | Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials, instruction book with MSDS and calibration tables. | |
| | COD (Mercury Free) Vials Kit | K-7366 |
| | Kit comes in a cardboard box and contains everything needed to perform up to 149 tests (except distilled water): 150 vials, instruction book with MSDS and calibration tables. | |
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0-15,000 ppm
Dichromate Reactor Digestion |
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Cat# |
| COD (Not USEPA Approved) Vials Kit |
*K-7370S |
| | Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials, instruction book with MSDS and calibration tables. | |
| | COD (Not USEPA Approved) Vials Kit | *K-7375 |
| | Kit comes in a cardboard box and contains everything needed to perform up to 97 tests (except distilled water): 98 vials, instruction book with MSDS and calibration tables. | |
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0-15,000 ppm
Dichromate Reactor Digestion |
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Cat# |
| COD (Mercury Free) Vials Kit |
K-7371S |
| | Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials, instruction book with MSDS and calibration tables. | |
| | COD (Mercury Free) Vials Kit | K-7376 |
| | Kit comes in a cardboard box and contains everything needed to perform up to 97 tests (except distilled water): 98 vials, instruction book with MSDS and calibration tables. | |
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Accessories |
| Description |
Cat# |
| | Vial Rack (holds 40 vials) | A-0107 |
| | Digestor Block (115/230 Volt, 12 cells) | A-0111 |
| | Calibration Standard, 1000 ppm (200 mL), Shelf-life 8 months. Must be refrigerated | A-7301 |
| | Calibration Standard, 10,000 ppm (200 mL), Shelf-life 8 months. Must be refrigerated | A-7310 |
| | COD Photometer (0-150 ppm) | A-7320 |
| | COD Photometer (0-1500 & 0-15,000 ppm) | A-7325 |
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