Figure 2. Stock solutions are stable over 5 years.
The concentrations of Cu (filled squares), Fe (open squares), Mn (filled circles), Se (open circles), and Zn (filled triangles) in stock solutions from a primary iteration of the revised trace element composition were measured by ICP-MS over a period of 61 months. Each solution was stored at room temperature in the dark. Before each sampling, the solution was filtered through a 0.22 μm filter nto a new container. Each metal solution was diluted to an appropriate concentration prior to injection into the ICP-MS.
