Alk Reagent drift?

[GaZZaW]

Hello,

I have a question about the Hanna Alk reagent.
I test Alk once or twice a week so a reagent lasts about 15 to 20 weeks.
I have noticed with the last 3 bottles of reagent that at the last 5ml or so that the readings have drifted down by about 1.5 dkh
A new reagent bottle shows the "correct"reading
any ideas wht this is happening.?
I have been using the hanna alk tester for years now without a problem until now.

 

[CK00020]

I have the same thing happen, there are multiple threads on here about this

 

[Shirak]

I think someone mentioned you are supposed to do 25 tests and then toss what’s left. I try to be quick with filling the syringe so the the fluid is exposed to as little air as possible each time. Don’t know if it helps but can’t hurt!

 

[Scdell]

Yep! More and more people complaining about this.I posted about this 4-5 months ago and all I got told was I was using the tester wrong. User error. Hmmmm.

 

[scardall]

Hello,

I have a question about the Hanna Alk reagent.
I test Alk once or twice a week so a reagent lasts about 15 to 20 weeks.
I have noticed with the last 3 bottles of reagent that at the last 5ml or so that the readings have drifted down by about 1.5 dkh
A new reagent bottle shows the "correct"reading
any ideas wht this is happening.?
I have been using the hanna alk tester for years now without a problem until now.

Air/moisture in time will cause your readings to be off. use a stds. kit to verify. Hanna std. kit for alk.

 

[Scdell]

Or just use a test kit that actually works