Does chloride interfere with the Chemical Oxygen Demand 2 (COD2) digestion vials?

Document ID

Document ID TE245

Published Date

Published Date 07/03/2018
Question
Does chloride interfere with the Chemical Oxygen Demand 2 (COD2) digestion vials?
Summary
Chloride interference in COD2 reagent vials
Answer
COD2 Vials are a mercury-free alternative to traditional COD tests.  Mercuric sulfate is used in traditional COD vials specifically to treat chloride interference.  Because of this, the COD2 reagents are susceptible to chloride interference at all levels.

For more information please see the article titled, Does Hach have any literature on Chemical Oxygen Demand (COD) testing?