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Depends on a couple of things.Salifert test result - 8.9
Hanna - 7.8
Which to trust?
Interesting. The Hanna test kit is pretty new. I would say 1 month old (to me)…. I did not know this about the color on salifert, I have stopped my dips at pink. So these results may be much closer than I originally thought. I use a mag stir device for my vials. So I will retry this comparison and stop the reading prior to a solid pink. Appreciate the response.Depends on a couple of things.
The Hanna Alk reagent is only really good for about a month after opening - after 3 months it reads very low unless stored refrigerated - probably due to oxidation of the reagent.
The salifert test effectively never expires however as pointed out above, the titration endpoint is not when the sample is completely pink, but when it is halfway there - a purple color.
Used consistently, I'd put my money on the salifert.
I 100% agree. I notice this the most with my Mag test. I have learned to let things work for a few seconds before continuing with that. But I will make an effort to do this “pause” technique with the others and see how things differ. Luckily I do monthly ICP tests, so I would know if things are way out of bounds. Just want to maintain the most consistency inbetween. Since I don’t run a controller of any kind it’s up to me and diligence to keep an eye on it all.Couple things, Yes the reagent can get oxidized, but yours should be good, but yes I have seen it go bad.
Also if you are using a mag stirrer (Bless these little things) once you get the color, stop the stirrer and see if it stays that color. This goes with other tests like Calcium. This has been my experiences anyway.
So do 3 test with Salifert and 3 test with Hanna. Average all results and that is your number….Salifert test result - 8.9
Hanna - 7.8
Which to trust?
I 100% agree. I notice this the most with my Mag test. I have learned to let things work for a few seconds before continuing with that. But I will make an effort to do this “pause” technique with the others and see how things differ. Luckily I do monthly ICP tests, so I would know if things are way out of bounds. Just want to maintain the most consistency inbetween. Since I don’t run a controller of any kind it’s up to me and diligence to keep an eye on it all.
For example: If I am doing a titration test for CA and introducing reagent a drop at a time when the solution goes from pink to blue. If I stop to mixer at that time the solution will turn back to pink. It is usually one or two drops after that that it stays blue.I personally do not think turning off the stirring makes chemical sense, but allowing time for each drop of titrant to chemically react before deciding if more is needed is important.