I took this to mean that almost all metals tested fell below the limits of the testing equipment: Many elements that were included in the ICPMS results were below the test's detection threshold of 0.5 ppb for all salt samples. Accordingly, these elements are not included in the data and comparisons below. These elements were: Beryllium, Scandium, Gallium, Germanium, Yttrium, Zirconium, Niobium, Ruthenium, Rhodium, Cadmium, Tin, Cesium, Lanthanum, Cerium, Praseodymium, Neodymium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Hafnium, Rhenium, Osmium, Iridium, Platinum, Thallium, Thorium, and Uranium. Silver and Tellurium were below the test's 5 ppb detection limit for all salts. Interestingly, Silver levels for Instant Ocean and Coralife were reported at 248 ppb and 410 ppb respectively in the 1999 Atkinson and Bingman study. Gold and Mercury were below their 50 ppb detection limit, and Iron was below the 500 ppb detection limit for all samples. The tests for several elements showed little significant difference between salt mixes. The data for these elements can be found in the Appendix.
The evidence over the years IMO is that there are no commercial salt mixes that are lethal to any aquarium life.