Heavy Metals and Human Health – Lecture 5 (February 8, 2012)
Classification of Metal:
Class A – low toxicity but we don’t say it’s not toxic.
Class B – very toxic, not essential to our chemical processes
Borderline – needed in small amounts
Mechanism of Toxicity
Arsenic is to
Bioavailability of Metals
Oxidize form of metals is usually less toxic.
Reduce form of metals are usually more toxic.
Highest concentration is in roots then in leaves for metal contamination. So corn would
be best to grow.
Very difficult to find it somewhere, maybe find it in thermometer.
Mercury is toxic in all forms (organic, inorganic).
Metal mercury is extremely toxic.
Mercury bio accumulates
How many times can you eat tuna fish can? Once a week and maximum twice
For pregnant women, they should not eat canned tuna fish and for children once a month.
If someone has been exposed to high levels of mercury – problems with memory lost and
some kind of madness.
Case Study: Environmental Impact of CCA Wood Preservative
What are the Wood Preservative
Production of CCA Treated Wood