These test methods cover the determination of the quantity of
oxygen that certain impurities in water will consume, based on the
reduction of a dichromate solution under specified conditions. The
following test methods are included:
Test Method A 2 Macro COD by Reflux Digestion and Titration
Test Method B 2 Micro COD by Sealed Digestion and
These test methods are limited by the reagents employed to a
maximum chemical oxygen demand (COD) of 800 mg/L. Samples with
higher COD concentrations may be processed by appropriate dilution
of the sample. Modified procedures in each test method (Section 15
for Test Method A and Section 24 for Test Method B) may be used for
waters of low COD content (< 50 mg/L).
As a general rule, COD results are not accurate if the sample
contains more than 1000 mg/L Cl−. Consequently, these test methods
should not be applied to samples such as seawaters and brines
unless the samples are pretreated as described in Appendix X1.
This test method was used successfully on a standard made up in
reagent water. It is the user's responsibility to ensure the
validity of these test methods for waters of untested matrices.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For specific hazard statements, see
Section 8, 15.6, and 24.5.
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