Which metals does SEMCORP use?

The now-withdrawn March reports indicated contamination by 13 metallic elements: aluminum, arsenic, zinc, lead, cobalt, cadmium, nickel, barium, chromium, copper, manganese, lithium and iron. 12 of them play no part in our manufacturing process. This also supports the finding that the March data were flawed: our manufacturing process could not have been the source of those 12 metals. We only use aluminum in two forms only — alumina (Al₂O₃) and boehmite (AlOOH). Both are ceramic powders, not metallic aluminum. Both are non-conductive, chemically stable and poorly soluble in water. 

Experts simulated the worst-case scenario. The materials were deliberately placed in direct contact with water under conservative conditions; the tests could not reproduce anything close to the extreme March readings