... compared to Hach DPD and Taylor OTO. R-0871 is ~ 3-months old; it started all at once.
Not shaking the reagent enough?
Not shaking the reagent enough?
Ward said:It was purple two-months ago when I first opened it, and is almost black now. It never did clump.
Do not remember spilling pool-water into the jar. The air here contains plenty water, and I try to replace the lid expeditiously.
Will add a pouch of desiccant to the new container.
I don't know the details of those tests. You can ask the manufacturers of the tests for more info. In general, chelated metal ions still get measured in the metal tests since the chelation of the metal is an equilibrium reaction and the metal gets unbound as it reacts with the chemicals in the test. However, whether it shows up depends on the rate or this release relative to the rate of reaction in the test.Ward said:Would you happen to know if the LaMotte Iron Insta-Test measures chelated, free, or total iron? Test results measured zero, whereas the Seachem MultiTest measured somewhat more. Before its powdered-reagent turned brown.