Why would the buffer solution for the CL17 Chlorine Analyser become discolored?

Document ID

Document ID TE2044

Published Date

Published Date 11/04/2019
Question
Why would the buffer solution for the CL17 Chlorine Analyser become discolored?
Summary
CL17 discolored buffer solution
Answer
If the DPD indicator powder is added to the buffer solution, rather than the indicator solution, it will turn the buffer solution a turbid brown color. If this happens, the buffer must be replaced with a new bottle. DPD powder must be added to the indicator solution as well for the chemistry to function in the analyzer.