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I don't think many of the TNT methods work with seawater sadly. We worked directly with them on a whole variety of methods and approaches. Maybe a few hundred samples attempts, dozens of calls with the lab and it just didn't work in the ranges we needed it to. I think the ones they do approve for sea water are based on the Cadmium Reduction Method.
They eventually helped us make a custom program to accurately read the Red Sea method. Then tested against a series of standards and it met the accuracy requirements for what we are using it for.
8192 Powder Pillows LR Cadmium Reduction
Ya unfortunately no. Hach is really geared towards the water/wastewater industry and some industrial. So they aren’t well suited towards saline environments, yet.
Plus the reactivity of free chlorine makes it a nuisance interference for many colorimetric analyses.


