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EESA10H3 (542)
Lecture 5

Lecture 5 Notes

2 Pages
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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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Lesson 5
Class A: Chemically as they form ionic bond-low toxicity
Class B: very nasty and toxic-form covalent bond. Most of em are toxic in their organic form
as much as they are in their organic forms. they form organometalics?-originally toxic or
borderlines.
Bioavailability,,,
Redox potential-ability to donate or take an electron.
Less oxygen availability= More toxic! And vice-versa
ROUTES...
Fruits then leaves than stems and roots-most concentration in the ROOTS then upwards.
Ex: you will find the most lead conc. In the roots.
If soil has slight contamination than its better to grow grain so that its going to have least.
Not carrots coz they are the roots and high conc. Will be in the roots. You can grow potato
too coz potato is not a root its a storage.
Mercury is toxic and can also go thru the gloves!. Just some drops that will go on a person is
enough to kill an adult. Very toxic its form can kill you but the least toxic state is its liquid
state. Biggest problem-bioaccumulation. Problem: content in fish ex. Tuna fish.
Health problems—nervousness or excitement without reason..mental illness, loss of
memory
Hatters illness-comes from hats that were made with mercury to make it stiff..pple ended
up with similar mental problems. Therefore its name
CASE STUDY: a landmark coz no one did anything to prevent problem. Caused by chemical
industry-came from industrial waters...fish consumed it...local communities ate fish and
had a large part of their diet on fish.
A girl 7 or 8yrs...she had a muscle weakness-confusion-disorientation and she cudnt talk.
Then a similar problem with a person who lived nearby and then the same problem was
seen in cats. Then it was discovered that the problem was mercury but the govt didnt react
fast problem went to 30yrs before action. Huge impact on those people and their generation.
CASE STUDY:
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Description
Lesson 5 Class A: Chemically as they form ionic bond-low toxicity Class B: very nasty and toxic-form covalent bond. Most of em are toxic in their organic form as much as they are in their organic forms. they form organometalics?-originally toxic or borderlines. Bioavailability,,, Redox potential-ability to donate or take an electron. Less oxygen availability= More toxic! And vice-versa ROUTES... Fruits then leaves than stems and roots-most concentration in the ROOTS then upwards. Ex: you will find the most lead conc. In the roots. If soil has slight contamination than its better to grow grain so that its going to have least. Not carrots coz they are the roots and high conc. Will be in the roots. You can grow potato too coz potato is not a root its a storage. Mercury is toxic and can also go thru the gloves!. Just some drops that will go on a person is enough to kill an adult. Very toxic its form can kill you but the least toxic state is its liq
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