This is a post by Troy Baker, an environmental scientist in NOAA's Office of Response and Restoration.
Chromium, manganese, zinc.
Elements like these may show up in a daily multivitamin, but when found in a certain form and concentration in water and soil, these elements can cause serious problems for fish, birds, and wildlife. As assessors of environmental harm from pollution, we see this scenario being played out at hazardous waste sites around the country.