Table 1 Nominal (Free Ion) Minimum Inhibitory Concentrations of Individual Transition Metals.

From: Synergistic Antimicrobial Effects of Silver/Transition-metal Combinatorial Treatments

Transition Metal E. coli Nominal (Free ion) B. subtilis Nominal (Free ion)
Ag 60 µM (22.8 nm) 60 µM (22.8 nm)
Zn 2 mM (980.1 µM) 0.25 mM (118.7 µM)
Cd 2 mM (229.3 µM) 0.015 mM (0.16 µM)
Ni 2 mM (531.6 µM) 2 mM (531.6 µM)
Cu 4 mM (163.9 µM) 2 mM (2.4 µM)
Co 1 mM (656.4 µM) 1 mM (656.4 µM)