Same water sample, but I got Phosphate mismatch between Hanna Phosphate ULR and ICP test.
ICP test result is 0.03
Hanna Phosphate ULR result is 0.08
(1) In order to see where the difference come from, today I tested with brand new cuvettes, and compared with the test I'm doing with old cuvettes. The new cuvettes shows 0.12. The old cuvettes shows 0.25. This is huge difference!
(2) I also checked the history (ICP test vs. Hanna Phosphate ULR).
ICP test Hanna checker
8-28-2023 0.03 0.08
4-19-2023 0.01 0.02
1-19-2023 0.02 0.01
In above results, I understand it's time to replace cuvettes to get accurate number. Old cuvettes shows higher number than actual. In my eyes, it does not tell difference between old cuvettes and new cuvettes. Both looks similar (I know my cuvettes for alkalinity test is blue tinted).
Any experience sharing would be helpful.
ICP test result is 0.03
Hanna Phosphate ULR result is 0.08
(1) In order to see where the difference come from, today I tested with brand new cuvettes, and compared with the test I'm doing with old cuvettes. The new cuvettes shows 0.12. The old cuvettes shows 0.25. This is huge difference!
(2) I also checked the history (ICP test vs. Hanna Phosphate ULR).
ICP test Hanna checker
8-28-2023 0.03 0.08
4-19-2023 0.01 0.02
1-19-2023 0.02 0.01
In above results, I understand it's time to replace cuvettes to get accurate number. Old cuvettes shows higher number than actual. In my eyes, it does not tell difference between old cuvettes and new cuvettes. Both looks similar (I know my cuvettes for alkalinity test is blue tinted).
Any experience sharing would be helpful.