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 27/05/2017
Question
Why should the COD vials not be inverted after finally allowing to cool to room temperature?
Summary
COD vial inversion
Answer
After inverting the COD vials after digestion, this will mix the sample including non-dissolved particles. It is important to allow these vials to settle before reading on a spectrophotometer as suspendid solids can affect results.