Stability Of Hanna Alkalinity Reagent

[taricha]

Back to the drawing board, making the alkalinity reagent fail..

My recollection is that the failures of stability were noted early after the release of the test, and possibly they redid the formula shortly after. As they have with multiple other recently released tests. Ammonia & Mg for example.

The EU vs US chemical difference is the other suggestion that sounds plausible to me.

 

[Dan_P]

My recollection is that the failures of stability were noted early after the release of the test, and possibly they redid the formula shortly after. As they have with multiple other recently released tests. Ammonia & Mg for example.

The EU vs US chemical difference is the other suggestion that sounds plausible to me.

Now there’s an idea that I haven’t considered. The problem might not exist anymore

 

[taricha]

Now there’s an idea that I haven’t considered. The problem might not exist anymore

checkable idea at least. Just have to get a couple of the people who most clearly noted instability to give a new bottle another shot over a few months.

 

[RelaxingWithTheReef]

Might be unrelated but I used to use Red Sea alkalinity pro kit, and I saw the floating slime/particles in the reagent of a new test kit. I contacted them and sent pictures and they said the reagent is bad and they sent me two replacement bottles.

What is this stuff? Does it mean the reagent will give false results?

With the Hanna tester I use glass vials to store the reagent, and the first thing I do is remove the floaters with the syringe. I have not seen any notable change in chemical accuracy when the reagent initially contained floaters.

But, if they are not removed, and a floater happens to be in the light beam when the tester is sampling the color, the floater can significantly alter the result by physically blocking some of the beam.


BTW - Good point that the drift issue may no longer be a problem. I'm in, and will try to duplicate the previous results over the next 60 days.

 

[Sophie"s mom]

I question if the reagent is a homogenous mixture and stays that way while stored. I swirl the bottle around before every test and haven’t had an issue. The longest I have had a bottle previously opened and stored is about 3 months, and I estimate that I have used about 20 bottles of reagent since I’ve owned the HI772 checker. Even down to the last test, it is within the margin of error when compared to my other tester. But it could be coincidental as well.

I do the same. I swirll all reagents around just a bit prior to use. Nobody ever told me to do that, I guess I just do it for piece of mind that nothing is settled on the bottom.