For COD testing what is the recommended sample pH range?

Document ID

Document ID TE10870

Published Date

Published Date 04/26/2019
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Question
For COD testing what is the recommended sample pH range?
Summary
COD Method 8000 sample pH range
Answer
Method 8000 does not specify a pH range for samples which shall be analyzed for COD. The digestion of organic compounds takes place with potassium dichromate in concentrated sulfuric acid so that pH doesn't play an important role.
However it is recommended to adjust and lower the pH in case the sample is strongly alkaline this case a small volume (0.5- 1 mL) of a concentrated sulfuric acid should be added to 1 L of sample.

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