Are COD results from HT200S and LT200 comparable?

Document ID

Document ID TE7601

Published Date

Published Date 07/14/2020
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Question
Are COD results from HT200S and LT200 comparable?
Summary
COD results obtained from different thermostates/digestors at different temperatures may vary.
Answer
As COD is sum parameter and combines very different organic carbon compounds, the effectiveness of the digestion is very different and depends on the conditions.
The convention says to digest at 148°C for 120 min.
If this conditions are changed to other temperatures and digestion times the effectiveness may increase or decrease. Subsequently the results may not be the same and can vary.
Customers must run comparison studies with their own samples in order to proof effectiveness the results are the same or different.

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