Phosphate vs Phosphorus

[Reefahholic]

H

Hi ,
I use the H1736 Phosphorous ULR which measures ppb and use the H1736 reagent . Is this the one you use and what is your target phosphate level as per the chart posted .thanks Bill

Yes sir, that is the one. I used to run ULN, but as you can see what happened above there is not much room for error unless you’re doing something like Zeovit. The corals get well fed, and are able to tolerate the very low PO4. Now, I try to keep it 0.03 to 0.2 ppm. Above 0.2 and there’s more algae to deal with, but it depends on the tank and the system. I’m ok with it in that range and I try not to chase it too much. Honestly I like it above 0.05 and under 0.15, but if it drifts a little I’m okay.

 

[J1a]

It would be great If some labs offee LC+ICP-MS to properly quantify organic phosphates.

 

[Randy Holmes-Farley]

It would be great If some labs offee LC+ICP-MS to properly quantify organic phosphates.

I've not seen any general trend for P by ICP (total P) to be higher than what folks measure by kit (inorganic P), so my expectation is that it is pretty low.

 

[J1a]

I've not seen any general trend for P by ICP (total P) to be higher than what folks measure by kit (inorganic P), so my expectation is that it is pretty low.

Isn't icp-os prone to interference when it comes to p? Could they have kind of take the short cut and calibrate it to inorganic kits?

 

[Randy Holmes-Farley]

Isn't icp-os prone to interference when it comes to p? Could they have kind of take the short cut and calibrate it to inorganic kits?

I do not know.

Christoph noted here that iodine and phosphorus are close at one spectral line, but I do not know if it causes significant interference in P, or whether other lines are used for P.

ICP test - high iodine?

I usually perform an ICP test every 3 months on my aquariums. This time around both, my 210 gal and 65 gal RSM showing high levels of IODINE. I know that it is difficult to test for Iodine and I do have a Salifert kit and it is actually showing "0" - so not sure what to make of this or if...

www.reef2reef.com

 

[J1a]

I do not know.

Christoph noted here that iodine and phosphorus are close at one spectral line, but I do not know if it causes significant interference in P, or whether other lines are used for P.

ICP test - high iodine?

I usually perform an ICP test every 3 months on my aquariums. This time around both, my 210 gal and 65 gal RSM showing high levels of IODINE. I know that it is difficult to test for Iodine and I do have a Salifert kit and it is actually showing "0" - so not sure what to make of this or if...

www.reef2reef.com

Seems that there maybe many possible interfence if this write up is accurate.

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[Randy Holmes-Farley]

Seems that there maybe many possible interfence if this write up is accurate.

Impurity Testing & Contamination Control Services

Impurity testing and contamination control services from Solvias help reduce your exposure to risk and improve the safety and efficacy of your drug.

www.solvias.com

The hobby companies are not using ICP-MS, but rather ICP-AES, so the interferences are completely different.

 

[J1a]

The hobby companies are not using ICP-MS, but rather ICP-AES, so the interferences are completely different.

Yeah. That's true.

Maybe can dig thru the NIST data base to see what are the lines available.