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- Sep 21, 2018
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Good supporting information and a method to generate a sample of degraded material for a VIS spectrum.Bromcresol green also suffers UV and possibly even visible light degradation.
I wonder if that might even be partly why storing in a fridge helps: not just cold but dark.
The Hanna reagent bottles are opaque black plastic. Whether the bottle is stored in the opaque black plastic box that holds the Checker or on the shelf, risk of UV exposure seems low.
Evaporation is my favorite cause right now. Many ways to fail here. Not tightening the cap. Losing the cap liner (mine always falls out all the time). Not removing all of the safety seal from the newly opened bottle. These things are difficult to get off in one piece. There is a good chance of leaving behind glue and irregularly shaped paper on the rim of bottle, a recipe for a poor seal and loss of head space vapor.
I will begin the study this week and will report back if something turns up or at the conclusion of the study when I use up the reagent around the fall of 2024.