EESA10H3 Lecture : information from lecture slides + information added by prof during lecture

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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 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) Order of toxicity: class b > borderline > class. Resistance: species develop mechanisms so that they will not intake certain metals (ex. Not all metals will cause harm, not all metals are available to the body ph affects the bioavailability, metals are more bioavailable and toxic in acidic solutions. Slides: routes of exposure inhalation (dust, fumes), ingestion (food, soil), through the skin.

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