Global Climate Change

Topics: Hazardous waste, Persistent organic pollutant, Sustainability Pages: 3 (846 words) Published: July 24, 2012
1. How do toxicologists investigate hazardous chemicals? How is this information disseminated to health practitioners and the public? To investigate hazardous materials they do tests on animals. Then investigate human involvement with the chemical and present information linking the dose of the chemical to the response. All available date on toxic chemicals is on its IRIS, which can be found online. 3. Define total product life cycle, and describe the many stages at which pollutants may enter the environment. Total Product Life Cycle- The sum of all steps in the manufacture process of a product, from obtaining the raw materials through producing, using, and finally disposing of the product At each step or in between steps wastes, by-products or the product itself may enter the environment. 5. What are the “dirty dozen” POPs? Why are they on the list? Aldrin, Chlordane, DDT, Dieldrin, Endrin, Heptachlor, Hexachlorobenzene, Mirex, Toxaphene, PCBs, Bioxins, Furans These are on the list because they are banned/highly restricted as a result of the Stockholm Convention on Persistent Organic Pollutants. 7. Describe the three methods of land disposal that were used in the 1970s. How has their use changed over time? Deep-well injections: Drilling thousands of feet below groundwater: consists of concentric pipes and casings that isolate wastes as they are injected Surface Impoundments: Excavated depressions in which liquid wastes are drained and held; the least expensive method Landfills: Wastes put into drums and treated in accordance with their chemical and physical characteristics 9. What is being done about leaking underground storage tanks and brownfields? The type of storage container used is being changed and the containers are being monitored better. Brownfields are being cleaned and reused; this helps create jobs. 11. What laws exist to protect the public against exposures resulting from hazardous-chemical accidents? What are the main features of the legislation?...
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