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Lecture

Study Guide for Lecture 5: information from lecture slides + information added by prof during lecture

2 Pages
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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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EESA10 – Human Health and the Environment
LECTURE 5
Slide: Heavy Metals
-Naturally occur ring (in soil), they can be extracted from
the ground as ore, after they are extracted, they enter a
cycle where they are incorporated into products where
they are used for something. Once used, they are
disposed of/waste, cannot be reverted back to original
-Widely dispersed in the environment, mainly because of
human activity. When they are in the environment, they
can enter human bodies just as any other chemical
would, where they can then cause harm to select tissues.
-Heavy metals are toxic even at very low levels (ppb)
Slide: Classification of Metals
-Metals are classified based on their toxicity
oClass A: for m ionic bonds (+ and – ions attract,
transfer); macronutrients, meaning they are
important components of biological processes
oClass B: for m covalent bonds (ions share
electrons); organometallics, meaning they are
metallic organic compounds, they are soluble
when they enter our bodies; very toxic
oBorderline: micronutrients, meaning they are
needed for some biological processes, but in very
low concentrations
-Order of toxicity: CLASS B > BORDERLINE > CLASS
A
Slide: Coping Mechanisms
- Resistance: species develop mechanisms so that they
will not intake certain metals (ex. Lead)
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Description
EESA10 Human Health and the Environment LECTURE 5 Slide: Heavy Metals - Naturally occurring (in soil), they can be extracted from the ground as ore, after they are extracted, they enter a cycle where they are incorporated into products where they are used for something. Once used, they are disposed ofwaste, cannot be reverted back to original - Widely dispersed in the environment, mainly because of human activity. When they are in the environment, they can enter human bodies just as any other chemical would, where they can then cause harm to select tissues. - Heavy metals are toxic even at very low levels (ppb) Slide: Classification of Metals - Metals are classified based on their toxicity o Cla
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