Why should the COD vials not be inverted after finally allowing to cool to room temperature?

Document ID

Document ID TE1853

Published Date

Published Date 04/24/2018
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Question
Why should the COD vials not be inverted after finally allowing to cool to room temperature?
Summary
COD vial inversion
Answer
Invert the COD vials after digestion while hot but do not invert after they have cooled to room temperature. This will mix the sample including non-dissolved particles. It is important to allow these vials to settle before reading on a spectrophotometer as suspended solids can affect results.

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