Fauna Marin MultiReference solution - I'm confused

[ZoWhat]

Just got my 100ml bottle of ICP tested/verified saltwater

It might be hard to read but it lists;
* nitrates at 10mg/liter and
* phosphates at 0,465mg/liter

I ASSUME that:
* 10mg/l = 10.0 ppm NO3
* 0,465mg/l = .465 ppm PO4

Right? Or no?

I took 10ml of this multireference saltwater and ran the Hanna Checkers as normal; 10ml vial of straight multireference solution to "0 out" to C1. Then added reagent and mixed for 2mins and tested under C2

My Hanna nitrate tested at 1.1 (??? completely confused thinking it would be close to 10.0)

My Hanna ulr phosphorus tested at 8ppbillion which converts to 0.024ppm PO4

Help I'm COMPLETELY CONFUSED


.

 

[homer1475]

It's my understanding 1mg/l is = 1ppm too.

 

[X-37B]

Just got my 100ml bottle of ICP tested/verified saltwater

It might be hard to read but it lists;
* nitrates at 10mg/liter and
* phosphates at 0,465mg/liter

I ASSUME that:
* 10mg/l = 10.0 ppm NO3
* 0,465mg/l = .465 ppm PO4

Right? Or no?

I took 10ml of this multireference saltwater and ran the Hanna Checkers as normal; 10ml vial of straight multireference solution to "0 out" to C1. Then added reagent and mixed for 2mins and tested under C2

My Hanna nitrate tested at 1.1 (??? completely confused thinking it would be close to 10.0)

My Hanna ulr phosphorus tested at 8ppbillion which converts to 0.024ppm PO4

Help I'm COMPLETELY CONFUSED


.

I have not done the po4 or no3 but will by the end of the day.

Here is my results from another post.
I will check po4 and no3 soon.
My tank this morning.
SG 1.0265
Temp 79
Alk Hanna 155-8.68
Alk salifert .46-8.3
Ca salifert .16-420
Mag salifert .11 1335

Fauna Reference Solution:
Alk reference 6.6
Alk Hanna 122-6.83
Alk salifert .57-6.55
CA reference 444
CA salifert .16-420
Mag reference 1346
Salifert .12 1320

My take: Hanna alk is still 0.3-0.4 higher.
My desired alk is 8+- 0.3 as I have raised it over the last month from 7. I just replaced my co2 tank yesterday and the numbers look good.
Salifert alk was almost an exact match.
CA and Mag are close enough for my system as compaired to salifert.

I will test po4 and no3 later today and report back.

It will be interesting to see other results.

 

[Lyss]

Just got my 100ml bottle of ICP tested/verified saltwater

It might be hard to read but it lists;
* nitrates at 10mg/liter and
* phosphates at 0,465mg/liter

I ASSUME that:
* 10mg/l = 10.0 ppm NO3
* 0,465mg/l = .465 ppm PO4

Right? Or no?

I took 10ml of this multireference saltwater and ran the Hanna Checkers as normal; 10ml vial of straight multireference solution to "0 out" to C1. Then added reagent and mixed for 2mins and tested under C2

My Hanna nitrate tested at 1.1 (??? completely confused thinking it would be close to 10.0)

My Hanna ulr phosphorus tested at 8ppbillion which converts to 0.024ppm PO4

Help I'm COMPLETELY CONFUSED


.

Same Q here. I used it for my HR Nitrate checker and got 0 -- the reagent didn't even turn the water a color at all, and the final result was 0. Have been scratching my head on that one.

 

[X-37B]

Just tested no3 with Elos

Fauna reference
No3 10
Elos >5 and <12

 

[X-37B]

Going to test po4 now and will report back.

No3 was close enough for me.

 

[X-37B]

Ok so Fauna po4 read 3 on my ulr.
Not sure what to take as I cant find any info on directions.
Funny how my other tests were close enough for me.

I did a ulr and a lr as I have them both. Lr was 0.

I will continue to use 2 tests and 3 for alk as backup.

I will still use Hanna for alk and po4.

I will use salifert as a cross reference and only salifert for ca and mag.

Elos and salifert for n03.

After 28 months I guess its time to send off some water to be tested for reference.

 

[Randy Holmes-Farley]

I ASSUME that:
* 10mg/l = 10.0 ppm NO3
* 0,465mg/l = .465 ppm PO4

Right? Or no?

.

Close, but not exactly.

1 ppm = 1 mg/kg exactly

But 1 L of seawater weighs more than 1 kg (about 1.0234 kg/L)
1 L = 1.0234 kg

Thus,
1 ppm = 1 mg/kg = 1 mg/kg / (1.0234 kg/L) = 0.977 mg/L

1 ppm = 0.977 mg/L

 

[ZoWhat]

Close, but not exactly.

1 ppm = 1 mg/kg exactly

But 1 L of seawater weighs more than 1 kg (about 1.0234 kg/L)
1 L = 1.0234 kg

Thus,
1 ppm = 1 mg/kg = 1 mg/kg / (1.0234 kg/L) = 0.977 mg/L

1 ppm = 0.977 mg/L

Thanks Randy

But still doesnt explain why my 10mg/l of Nitrate solution (ICP tested) is still only testing 1.1ppm NO3 thru a Hanna Checker.

Am I missing a calculation or a Hanna testing requirement?

Is this multireference solution INCOMPATIBLE with Hanna?



.

 

[ZoWhat]

Ok so Fauna po4 read 3 on my ulr.
Not sure what to take as I cant find any info on directions.
Funny how my other tests were close enough for me.

I did a ulr and a lr as I have them both. Lr was 0.

I will continue to use 2 tests and 3 for alk as backup.

I will still use Hanna for alk and po4.

I will use salifert as a cross reference and only salifert for ca and mag.

Elos and salifert for n03.

After 28 months I guess its time to send off some water to be tested for reference.

My Hanna ULR was "8"
Yours "3"

....and we have the same batch of Saltwater per our two labels

Hmmmmmm. Idk what to think

 

[Randy Holmes-Farley]

Thanks Randy

But still doesnt explain why my 10mg/l of Nitrate solution (ICP tested) is still only testing 1.1ppm NO3 thru a Hanna Checker.

Am I missing a calculation or a Hanna testing requirement?

Is this multireference solution INCOMPATIBLE with Hanna?



.

True.

Either the standard or test kit are not correct for some reason if they do not match.

It is not incompatible.

 

[ZoWhat]

True.

Either the standard or test kit are not correct for some reason if they do not match.

It is not incompatible.

@Randy Holmes-Farley

Since we are dealing with no3 and po4 inside a bottle that could possibly has been tested weeks, if not months ago....

Could the no3 and po4 numbers just dissipate to lower and lower numbers over time sitting in a sealed plastic bottle???

 

[Randy Holmes-Farley]

@Randy Holmes-Farley

Since we are dealing with no3 and po4 inside a bottle that could possibly has been tested weeks, if not months ago....

Could the no3 and po4 numbers just dissipate to lower and lower numbers over time sitting in a sealed plastic bottle???

There could be algae growth in it, if they have not inhibited it somehow. The growth will take up some N and P.

 

[taricha]

@Rick Mathew is this the multi-reference solution you've used and had positive results from?

 

[Rick Mathew]

@Rick Mathew is this the multi-reference solution you've used and had positive results from?

Yes...That is it...

 

[Chrisv.]

I hate to be behind, but have we seen positive control data from the checkers that indicates that they're accurate using other standards?

 

[Rick Mathew]

There could be algae growth in it, if they have not inhibited it somehow. The growth will take up some N and P.

Interesting point....I have a bottle that has been sitting around for quite a while...Unopened...I think I will check it out...I can not find an expiration date on it and no warnings of caution for corrosive material so it is not likely an acidic solution...Will check it out and post the results

Rick

 

[taricha]

I hate to be behind, but have we seen positive control data from the checkers that indicates that they're accurate using other standards?

yeah, I'll quote this post from another thread today.

Here's a quick look at some data for those who want to see what the hanna P test does vs calculated stock additions, and how it compares to hanna uncertainty statements.
Hanna's accuracy statement for the ULR P checker is "+-5ppb +-5% of reading" without any clarity as to whether you should take the larger of the two uncertainties or add them.

First, here's one I did with new Instant Ocean spiked with Seachem Flourish Phosphorus. This was measured a day after the spike.

The error bars shown are +-5ppb, and the black line is the Ideal case if I make perfect solutions, the stock product is completely accurate, and there no loss in the sample.

Here's me spiking my tank water with known additions of monopotassium phosphate (KH2PO4) - blue data.
The yellow data points are what happened when I tried to run it in straight distilled water (spiked with P) - it seems to fail completely.

(error bars here are +-5%)

And after seeing the failure with straight distilled water, I wanted to know for sure if I could get away with diluting saltwater with distilled (which has seemed to work for me before). Tagging @Dan_P and @Rick Mathew on this one.

Tank water, spiked with P, diluted from 100% to 80%, 60% etc with distilled water. Seems to work fine, and you can likely get away with diluting an out of range tank water sample by 1/2 or 1/4 with distilled water, and the hanna test will still give pretty much expected results. Just don't run it in straight distilled water.

(error bars +-5ppb)

If you take the common interpretation of of hanna's accuracy statement: "+-5ppb" or "+-5%" whichever is larger, then the accuracy statement covers almost all the data above, as seen by the error bars. If you take the more conservative interpretation to add +-5ppb and +-5%, then all points shown above fall inside, even with whatever unknown errors are hiding in my sample mixing, or stock purity, or loss in the sample.

Overall, the hanna ULR P kit is the most impressive chemical test in the hobby, IMO.

 

[Potatohead]

My Hanna ULR was "8"
Yours "3"

....and we have the same batch of Saltwater per our two labels

Hmmmmmm. Idk what to think

Within the noise of the checker

 

[Chrisv.]

yeah, I'll quote this post from another thread today.

Thanks for so rigorously showing this! Any chance you plan to test the nitrate checker?