Randy Holmes-Farley
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My Tank Thread
They can’t detect 1 ug/l ?
Yes, but surface seawater can be far lower. In any case, exact values for iron are irrelevant. A huge range is acceptable.
https://www.reefedition.com/my-triton-testing-results-by-randy-holmes-farley/
Iron (Fe). The natural iron level varies a lot with depth, but surface seawater may have only 0.006 µg/L. The Triton LOD = 0.3 µg/L. I dose iron, and when I dose it I boost iron to roughly 1-2 µg/L, which would be detectable. This sample was taken more than a week after the last iron dosing, and none was detected as it gets depleted in the meanwhile. I’ve not yet seen a Triton test result for a real aquarium sample that had detectable iron, but that doesn’t mean these tanks are necessarily deficient. Iron is also a case where the form is critical, and ICP cannot distinguish form. Binding to organic matter, for example, can alter the bioavailability of iron.
