I'd like to keep this a potassium thread. I folks want to discuss other zeovit issues, please start another thread. 
potassium
- Thread starter Bebo77
- Start date
Randy, any idea if K ion selective probe would get too much interference from other ions in salt water?
I don't know. I used to have a table of interferences for ion selective electrodes put out by Orion, but when Thermo bought them, they stopped showing that, at least that I could find.
I don't know. I used to have a table of interferences for ion selective electrodes put out by Orion, but when Thermo bought them, they stopped showing that, at least that I could find.
Rugrat2006
In Memoriam
It's too much for the test K+
Orochimaru
1 of 3 legendary ninjas
in case you want to do it yourself; might be cheaper...hahahaha
Eosin Y TS (adsorption indicator)â€"Dissolve 50 mg of eosin Y in 10 mL of water.
Assayâ€" Dissolve about 200 mg of Potassium Chloride, accurately weighed, in 10 mL of water. Add 10 mL of glacial acetic acid, 75 mL of methanol, and 3 drops of eosin Y TS. Titrate, with shaking, with 0.1 N silver nitrate VS to a pink endpoint. Each mL of 0.1 N silver nitrate is equivalent to 7.455 mg of KCl.
Eosin Y TS (adsorption indicator)â€"Dissolve 50 mg of eosin Y in 10 mL of water.
Assayâ€" Dissolve about 200 mg of Potassium Chloride, accurately weighed, in 10 mL of water. Add 10 mL of glacial acetic acid, 75 mL of methanol, and 3 drops of eosin Y TS. Titrate, with shaking, with 0.1 N silver nitrate VS to a pink endpoint. Each mL of 0.1 N silver nitrate is equivalent to 7.455 mg of KCl.
Orochimaru
1 of 3 legendary ninjas
I believe it's Cl since you are forming AgCl.
spamin76
Premium Member
Ok - I have a pretty good idea of what potasium does in vertebrates and higher vertebrates, but what is potassium going to do for corals - biochemically or physiologically if anything at all? Do corals need potassium, and if so how do they use it?
I am guessing that potassium is not going to make a huge difference in the overall make up of the water chemistry since it is not all that different from things like sodium... just floating around as ions what does potassiun really do that would make a tank that much better?
I am guessing that potassium is not going to make a huge difference in the overall make up of the water chemistry since it is not all that different from things like sodium... just floating around as ions what does potassiun really do that would make a tank that much better?
Ok - I have a pretty good idea of what potasium does in vertebrates and higher vertebrates, but what is potassium going to do for corals - biochemically or physiologically if anything at all? Do corals need potassium, and if so how do they use it?
All organisms, or at least nearly all, need potassium to live. It is a very important ion inside of most cells. The question is whether aquaria get depleted from normal seawater values, and if they do, is there any consequence for tank organisms. IMO, the evidence of benefit to aquaria is sketchy at present.
All organisms, or at least nearly all, need potassium to live. It is a very important ion inside of most cells. The question is whether aquaria get depleted from normal seawater values, and if they do, is there any consequence for tank organisms. IMO, the evidence of benefit to aquaria is sketchy at present.
I found this table for the current Thermo Orion Potassium selective electrode. It looks good to go in seawater:
http://www.thermo.com/eThermo/CMA/PDFs/Articles/articlesFile_18716.pdf
from it:
Levels of Possible Interferences (in ppm) Causing a 10% Error
Interferences to Potassium Chloride
Cs+ 100
NH4+ 270
Tl+ 3140
H+ 1.6= pH
Ag+ 276,500
*Tris+ 310,500
Li+ 35,600
Na+ 117,900
* Tris is the cation of tris(hydroxymethyl) aminomethane.
http://www.thermo.com/eThermo/CMA/PDFs/Articles/articlesFile_18716.pdf
from it:
Levels of Possible Interferences (in ppm) Causing a 10% Error
Interferences to Potassium Chloride
Cs+ 100
NH4+ 270
Tl+ 3140
H+ 1.6= pH
Ag+ 276,500
*Tris+ 310,500
Li+ 35,600
Na+ 117,900
* Tris is the cation of tris(hydroxymethyl) aminomethane.
Originally posted by Dr. Mac
Anyone use NSW and used this test? I have tested bottled NSW and also water that has come in shipments direct from the Solomon Islands and I know that is NSW too and the results of both are about 250 with the Zeo K test. Despite the test being difficult to read the results on NSW I have checked with this kit are not at 400.
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Randy any idea why this happens? I know nsw levels are supposed to test potassium at levels of 400.. but it seems that no one has that high of a level without dosing....Maybe out saltwater mixes dont have enough K+ to begin with...
I think it more likely the kit is inaccurate than that the oceans have recently become depleted in potassium.
Seriously, seawater, even in shore water, should not be that depleted in potassium even if the salinity is a bit low from runoff.
Anyone use NSW and used this test? I have tested bottled NSW and also water that has come in shipments direct from the Solomon Islands and I know that is NSW too and the results of both are about 250 with the Zeo K test. Despite the test being difficult to read the results on NSW I have checked with this kit are not at 400.
--------------------------------------------------------------------------------
Randy any idea why this happens? I know nsw levels are supposed to test potassium at levels of 400.. but it seems that no one has that high of a level without dosing....Maybe out saltwater mixes dont have enough K+ to begin with...
I think it more likely the kit is inaccurate than that the oceans have recently become depleted in potassium.
Seriously, seawater, even in shore water, should not be that depleted in potassium even if the salinity is a bit low from runoff.
F35-Joint Strike Fighter
New member
I don't think the test kit is accurate either IMO.
Bump for good thread!
Bump for good thread!
Rugrat2006
In Memoriam
I plan to buy kalium test kit, now I need to cancel it since it's not accurate for me to use it. Please let me know which test kit should I go for it?
F35-Joint Strike Fighter
New member
you can wait for Salifer, hopefully they will have one before the X-mas .
Rugrat2006
In Memoriam
Did you call them?
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