Skeptical Reefkeeping 12: Triton Lab ICP-OES Testing of a Certified Artificial Saltwater Standard ? Rich Ross
Interesting read. It gives you insight into exactly how these machines work, and what the results mean. According to the article, triton has some accuracy problems when compared to know concentrations.
I think these tests should probably be treated just the same as an other ICP test. Use them as a general guide, and don't take the numbers to be absolutes. Like I said before, if your step you is reading 6ppm, then you're probably fine. If it's reading 2ppm, then you should probably dose a little. However, if with a standard donation of variance of accuracy, they can be useful guides for monitoring trends in our tanks that we otherwise wouldn't have access to.