Phosphate testing

[JonasRoman]

I've ran into this a few times, my Hanna & Salifert results are always higher than what I get back on ICP. I'm no chemist but i've always had a suspicion that nutrients are getting consumed by the bacteria in the water on the 2 week ride to testing.

Doesn't matter if po4 is consumed as icp measure P, not po4, and thus is not sensitive to consumption of po4.

 

[BuffaloLake]

I have a 310 gallon system running the full Triton method. I have a Trident NP on the system, backed up by Hanna checkers. I had been getting wildly different results on the readings. So I recorded the Trident results, then ran 3 Hanna tests, then took a sample for an ICP. These are my readings from that test:
Trident NP 0.22
Hanna ULR Phosphate average 0.39
Triton ICP 0.07

Nitrate was also wildly different between Hanna and Trident. But I didn’t see nitrate listed on the ICP

Kinda at a loss on what I can trust.

ICP measures P not PO4. What was measured or reported?

Phosphorus came back 25.00

Phosphate at 0.077

Per Triton ICP

 

[BuffaloLake]

I have a 310 gallon system running the full Triton method. I have a Trident NP on the system, backed up by Hanna checkers. I had been getting wildly different results on the readings. So I recorded the Trident results, then ran 3 Hanna tests, then took a sample for an ICP. These are my readings from that test:
Trident NP 0.22
Hanna ULR Phosphate average 0.39
Triton ICP 0.07

Nitrate was also wildly different between Hanna and Trident. But I didn’t see nitrate listed on the ICP

Kinda at a loss on what I can trust.

ICP measures P not PO4. What was measured or reported?

 

[JonasRoman]

Phosphorus came back 25.00

Phosphate at 0.077

Per Triton ICP

PO4 is not measured by triton. It's just calculated from 25 ppb Phosphorus.