Hanna Checkers Shake Time

[LiquidSpace]

Interesting. I shake mine "gently", as you said, because that's how the directions read to me.
*Alkalinity is the only one that I "invert" (5 times)

Shaking Phosphate ULR is what I've always done,,, and it's always compared well to other tests (the few times I've done comparisons).

Yeah, I wasn’t sure of the results because it seemed so far off. My “gently” shake is the same as the nitrate so I probably need to find a middle ground.

@Miami Reef are you shaking at all or just inverting like the alkalinity test?

Also do you guys wear gloves when handling reagents?

 

[gbroadbridge]

Yeah, I wasn’t sure of the results because it seemed so far off. My “gently” shake is the same as the nitrate so I probably need to find a middle ground.

Do you guys wear gloves when handling reagents?

That video is not from Hanna Instruments, it is from some unknown person.

This is the official one:

 

[LiquidSpace]

That video is not from Hanna Instruments, it is from some unknown person.

This is the official one:

I also realized it was for Phosphorous. That is DEFINITELY not a gentle shake!

 

[EricR]

I also realized it was for Phosphorous. That is DEFINITELY not a gentle shake!

Yeah... my "gentle" shake would be considered "vigorous" compared to this video. (You should see my "vigorous" process for Nitrate HR).
I do find it amusing that, while concern was for disruption, he was still moving the tester around while it was timing down.

Beyond that, I enjoyed hearing "sache":
A word that I have never and will never use during whatever time I have left on this Earth.
...just kidding (kinda)

 

[Miami Reef]

Yeah, I wasn’t sure of the results because it seemed so far off. My “gently” shake is the same as the nitrate so I probably need to find a middle ground.

@Miami Reef are you shaking at all or just inverting like the alkalinity test?

Also do you guys wear gloves when handling reagents?

Phosphate instructions:

Replace the cap and shake gently for 2 minutes until the powder is completely dissolved.

https://www.hannainst.com/hubfs/pro...EkCXissJ8tkSY6LzJu_CyvLWh7JlrDAyDF4ysdIZQGWWP

Nitrate HR instructions:

Replace the cap and shake vigorously for 2 minutes.

https://cdn1.npcdn.net/userfiles/19...feac806e633b89589f59b5e70c23/ist782_05_21.pdf

 

[VintageReefer]

@Mikeltee where you go dude?! I’m hoping you have the forum setting enabled to get emailed when tagged or when someone replies to a thread you created. I hope everything is ok! Hit me up if you see this!

 

[gbroadbridge]

Nitrate HR instructions:

Replace the cap and shake vigorously for 2 minutes.

You would honestly think that Hanna, being the instrument manufacturer would quantify 'vigorously' , or maybe it really doesn't matter that much at all as long as it is somewhere between shaking a cocktail and driving a bumpy road. :cool:

 

[taricha]

You would honestly think that Hanna, being the instrument manufacturer would quantify 'vigorously' , or maybe it really doesn't matter that much at all as long as it is somewhere between shaking a cocktail and driving a bumpy road.

Doesn't really matter. Turns out the "gently" in the PO4 instruction is because it doesn't need "vigorously" and it's mostly intended to lessen the issues of bubbles.
I have always shaken the PO4 test hard (~3 full shakes per second) all the way for 2 minutes, because I originally missed the "gently" in the instructions.
This shake works fine for PO4 (compares well vs standards) and works for the HR NO3 that says "vigorously".

Shake as hard as you want - make sure the optical surfaces are bubble-free. all good.

 

[Miami Reef]

Doesn't really matter. Turns out the "gently" in the PO4 instruction is because it doesn't need "vigorously" and it's mostly intended to lessen the issues of bubbles.
I have always shaken the PO4 test hard (~3 full shakes per second) all the way for 2 minutes, because I originally missed the "gently" in the instructions.
This shake works fine for PO4 (compares well vs standards) and works for the HR NO3 that says "vigorously".

Shake as hard as you want - make sure the optical surfaces are bubble-free. all good.

Hi. While you’re here, I have a question.

My Hanna phosphorus ppb ULR tests significantly lower than the phosphate ppm ULR.

I used 2 brand new vials: one control and the other with the reagent, and both contained filtered tank water. I did 3 trials with each test.

How do I know if my tank is at 0.01ppm (Hanna PPB checker) or 0.07ppm (Hanna PPM checker?)

 

[taricha]

How do I know if my tank is at 0.01ppm (Hanna PPB checker) or 0.07ppm (Hanna PPM checker?)

so your ulr ppb checker is giving you around ~4ppb (+-5ppb +-5%) could be 11ppb P = 0.033 ppm PO4
and your ulr ppm checker is giving 0.07 (+-0.02 +-5%) could be .046ppm PO4.
even the extent of their error bars don't quite overlap, but it's quite close.

When you read the cuvettes in the other checker, what do you get? Do they read the same color vial differently (digital eyeball disagreement), or are their reagent packs generating different color on the same water (chemical disagreement)?

 

[Miami Reef]

so your ulr ppb checker is giving you around ~4ppb (+-5ppb +-5%) could be 11ppb P = 0.033 ppm PO4
and your ulr ppm checker is giving 0.07 (+-0.02 +-5%) could be .046ppm PO4.
even the extent of their error bars don't quite overlap, but it's quite close.

I’m sorry. I tried googling how to convert ppb to ppm and I think that’s where the discrepancy lies:

Hanna PPB:
Trial 1: 14
Trial 2: 14
Trial 3: 10

Hanna PPM:

0.07ppm
0.05ppm
0.07ppm

The chart shows values that align.

 

[Miami Reef]

When you read the cuvettes in the other checker, what do you get? Do they read the same color vial differently (digital eyeball disagreement), or are their reagent packs generating different color on the same water (chemical disagreement)?

I’m using the same 2 vials for all the trials.
I’m using the phosphate ULR reagent since they are interchangeable from what I’ve read.

 

[taricha]

I’m sorry. I tried googling how to convert ppb to ppm and I think that’s where the discrepancy lies:

Hanna PPB:
Trial 1: 14
Trial 2: 14
Trial 3: 10

Hanna PPM:

0.07ppm
0.05ppm
0.07ppm

The chart shows values that align.

oh, nice! That answer is much simpler than my error bars nonsense.
1ppb P = 3.06 ppb PO4
13ppb P = 40ppb PO4 = 0.040ppm PO4 which is going to be much closer agreement with your other checker reading 0.05 to 0.07 ppm.

 

[Miami Reef]

Thank you very much!