EESA10H3 Lecture Notes - Lecture 5: Fume Hood, Biomolecule, Wood Preservation
18 Jun 2016
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Heavy metals: we call them this because they are all toxic. Part of earth core, earth"s crust where we mine them from (in ore). Once we mine them, they enter some cycle and won"t go back to ground or disappear. Organic can break down into something else, but not metals. This makes them very dangerous, also because they spread very quickly. They accumulate in body tissues (bioaccumulation) which also makes them very toxic (even in very low concentrations). All essential elements, needed by all living organisms. They are required in high amount for survival. Since they are macronutrients they are also not very toxic. They have a tendency to form ionic bonds (to become charged). These elements can be toxic but depends on how much someday has to take in to become toxic. Nonessential elements, not required by organisms, tend to form covalent bonds and are extremely toxic.
