Hazardous chemicals narrated - 1 Toxicology and Chemical...

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1 Toxicology and Chemical Hazards (Chapter 22)
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2 Word Bank Persistent organic pollutants Threshold, dose, response Hazardous materials Cuyahoga River Orphan sites Superfund Clean Air Act, Clean Water Act, RCRA Point source, non-point source OSHA Biomagnification, bioaccumulation Polychlorinated biphenyls (PCB's) Dioxin Asbestos Lead Gasoline
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3 Word Bank Mercury Estrogenic/anti- estrogenic Asbestosis Hemoglobin Red blood cells Organic Hg, inorganic Hg Crazy cats
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4 Toxicology and Chemical Hazards Toxicology: the study of the harmful effects of chemicals on human and environmental health Acute effects: immediate reaction to a chemical following exposure Chronic effects: reaction to a chemical following exposure over a time scale of years - content/uploads/2009/07/michael- jackson.jpg
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5 Toxicology and Chemical Hazards Persistent organic pollutants (POPs) DDT, PCBs, dioxins, etc. Found in fish and the people who eat them How’d they get to the Arctic circle? Persistence Bio magnification Transportability
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6 Hazmat Hazardous materials Ignitability (ignite) Corrosivity (corrosive) Reactivity (react) Toxicity (toxic) /GasTruckNFPAsign.jpg
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7 Toxicology and Chemical Hazards Black stars: Background information, no need to memorize in detail.
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8 How do chemicals get into the environment anyway? Hair spray, pesticides, fertilizers, road salts, paints, adhesives, solvents, coal products, gasoline, oil, antifreeze, carwash soap, lubricants, cleaning fluids, and all the byproducts that go into making them.
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9 Toxicol ogy and Chemic al Hazard s
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10 Toxicology and Chemical Hazards
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11 The Cuyahoga River in the 1960s carried so much flammable waste that it caught fire.
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12 Methods of Land Disposal Deep-well injection Surface impoundments Landfills
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13 Deep-well injection: inject the wastes deep and eventually they will react with naturally occurring material to neutralize them.
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14 Surface impoundments: Waste is discharged into a LINED pond, solid waste settles, water evaporates, and the layers continue.
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15 Landfills: hazmat are treated to stabilize and neutralize and are deposited in landfills in drums. “Secure” landfill has extra precautionary measures, e.g., liners, leachate removal, etc.
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16 Midnight Dumping: Some non-reputable companies simply dumped barrels and pocketed the fees.
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