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We discussed (@taricha, @Rick Mathew ) this question, but I only recall one idea. If the ICP portion of the analytical method is a source of variability, whether you measure light emission or detect ions, the ICP-X results still suffer from variability of the ICP method. If mass spec improves the sensitivity of the ppb level elements, that would be an improvement. I am not clear how much the variability in ICP discounts the higher sensitivity of mass spec.I wonder how their Mass Spec testing compares. they have them on sale and $30 per kit seems like a good deal if the data is any good.