LaMotte CHEMICAL OXYGEN DEMAND AB-COD - Manual (Page 4)

STAN DARD SO LU TION
The procedure and reagents can be checked using a standard solution of
potassium biphthalate. Potassium biphthalate yields 98-100% of the
theoretical oxygen demand and also is stable over a period of time. A
Potassium Biphthalate Solution (7589) is furnished in the kit and has a
theoretical oxygen demand of 500 mg/L for a 10 mL sample. Appropriate
dilutions can be made to bring the concentration of potassium biphthalate
within the desired range.
REFERENCES: Standard Methods for the Examination of Water and Waste Water,
16th Edition APHA, AWWA, WPCF, New York, 1985.
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