Hanna checker for Nitrate update

Hi Joe, could you ask them why they can't replace the powder packs with some liquid reagent? Asking because I remember an Italian reefer once posted saying folks in europe use a liquid reagent from some other vendor with hanna testers, worked fine. I personally use HI736 reagent with HI93713 portable, works fine, my guess many of them are just the same. But why can't hanna offer it in liquids? I couldn't find that europeon product here, and forgot the name.
 
Liquid reagents often are less stable than dry reagents. That might have something to do with the choices made. I'm not enough of a chemist to be sure of all the possible issues.
 
I know that is why red sea switched from liquid to solid reagents. They said the liquid reagents were not as stable for their older nitrate pro test kit. I am quite certain J. Bertoni is correct here on his assumption.
 
I used some of their old kits with liquid reagents. I bought one set, it failed badly, and I moved on to another brand.
 
laga77 said:
I think a lot of people who are not chemists, like me, would prefer the display in dKH.
Click to expand...

Because it's so hard to multiply by .056? :hmm4: We have a thing called a calculator or a pen and paper if you prefer. :lol: Just a friendly nudge. :)
 
Scubajoe1 said:
Lastly, As we have the alkalinity Checker for saltwater aquariums, I am curious if we should offer a unit that displays in dKH as opposed to calcium carbonate. It seems that in the forums dKH is more common. Since it is only a change in programming it would be relatively easy to do as well.
Click to expand...

This was the reps question and I agree with what he states. Most hobbyists use dKH. Therefor, why not display the format most used?
 
Well if this thread gets forwarded to Hanna to view........

Would be keen to see a No3 also.
dkh YES
On the Po4 ULR that add packet & shake for 2mins & clean the bottle & get it back in with a 3mins shutoff is a stop watch procedure....only way i get it done is to pour the packet out into a piece of bent cardboard to get it all in & within time.
Works but times fine....
 
2una said:
Well if this thread gets forwarded to Hanna to view........

Would be keen to see a No3 also.
dkh YES
On the Po4 ULR that add packet & shake for 2mins & clean the bottle & get it back in with a 3mins shutoff is a stop watch procedure....only way i get it done is to pour the packet out into a piece of bent cardboard to get it all in & within time.
Works but times fine....
Click to expand...
Use both vials. One which will be used to zero out the Checker. Use the other one to test.

Add your reagent into one of the vials and shake as long as you need to.
Then add the vial without the reagent into the checker to zero out the checker.
Finally add the vial with reagent you already shook up into the checker to test.

It's not rocket science guys, you just have to be diligent when doing these tests.
 
you do not want to use separate vials. If there are any differences in the glass from one vial to the other this will add or subtract from your reading. Just saying.
 
Scubajoe1 said:
you do not want to use separate vials. If there are any differences in the glass from one vial to the other this will add or subtract from your reading. Just saying.
Click to expand...

I'll go put that extra vial in my curio cabinet to look pretty then. :lmao:
 
my biggest issue w/the Hanna checkers are when opening a new reagent bottle for ALK, just for fun I grabbed 2 tank water samples. Compared open bottle reagent to new reagent. Open bottle was giving me consistently high readings. New un-open reagent was giving a very low ALK number that continued to read low every day. So which one do I trust? The one saying my Alk is 8.2 or the one saying my ALK is 6.8?
 
amcvay1979 said:
my biggest issue w/the Hanna checkers are when opening a new reagent bottle for ALK, just for fun I grabbed 2 tank water samples. Compared open bottle reagent to new reagent. Open bottle was giving me consistently high readings. New un-open reagent was giving a very low ALK number that continued to read low every day. So which one do I trust? The one saying my Alk is 8.2 or the one saying my ALK is 6.8?
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Use some two part to make a known test solution.
 
I can look up a formula for a 2-part standard, but it will require a precision scale. What do you have available?
 
Use 5 gallons of RODI to 3 grams of dry soda ash or 4.7 grams of dry sodium Bicarbonate to make a 150 PPM solution. If you use a smaller volume of water errors in measuring will make a larger error in final concentration.
 
amcvay1979 said:
my biggest issue w/the Hanna checkers are when opening a new reagent bottle for ALK, just for fun I grabbed 2 tank water samples. Compared open bottle reagent to new reagent. Open bottle was giving me consistently high readings. New un-open reagent was giving a very low ALK number that continued to read low every day. So which one do I trust? The one saying my Alk is 8.2 or the one saying my ALK is 6.8?
Click to expand...

You can buy a Salifert kh test kit and use supplied standard liquid in it to test Hanna Checker (of course, you can use the kits itself, too :) )
 
Found this in Science Direct
Maybe this is the way to go....no more cadmium?

Michigan Technological University
http://journals.plos.org/plosone/article"¦
Open-Source Photometric System for Enzymatic Nitrate Quantification
B. T. Wittbrodt,
D. A. Squires,
J. Walbeck,
E. Campbell,
W. H. Campbell,
J. M. Pearce
Published: August 5, 2015
DOI: 10.1371/journal.pone.0134989
-------------------
Praslin
 
That link doesn't work due to cut and paste issues, but I don't think cadmium in a nitrate test kit is particularly dangerous. I don't know what reagents that test might use, but enzymes might be rather hard to get.
 
Nitrate reductase , prod of it is rather standard procedure, It might be a step in the right direktion ,or..? :)
 
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