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