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5220 Chemical Oxygen Demand (COD)

5220 Chemical Oxygen Demand (COD)

Approved by SM Committee: 1997

[E] - EPA Approved

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Description

The open reflux method (5220B) is suitable for a wide range of wastes where a large sample size is preferred. The closed reflux method (5220C and D) are more economical in the use of metallic salt reagents and generate smaller quantities of hazardous waste, but require homogenization of samples containing suspended solids to obtain reproducible results. Ampules and culture tubes with pre-measured reagents are available commercially. Measurements of sample volumes as well as reagent volumes and concentrations are critical. Consequently, obtain specifications as to limits of error for premixed reagents from manufacturer before use. Determine COD values of >50 mg O2/L and from 5 to 50 mg O2/L (with lesser accuracy) by using procedures found in 5220B. This section is reprinted from the 20th Edition.

Methods

[E] [R] [N] Product
       A. Introduction
       B. Open Reflux Method
[E]      C. Closed Reflux, Titrimetric Method
[E]      D. Closed Reflux, Colorimetric Method