CHAPTER 19 - CHAPTER 19 HAZARDOUS CHEMICALS: POLLUTION AND...

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CHAPTER 19 HAZARDOUS CHEMICALS: POLLUTION AND PREVENTION I. What are Hazardous Substances? A. Explain Each of the Following: 1. Ignitable 2. Corrosive 3. Reactive 4. Toxic B. Toxicity is an Inherent Characteristic of a Substance 1. The dose makes the poison 2. Exposure a. Ingestion b. Inhalation c. Skin Absorption 3. Elimination a. Metabolic breakdown of substance b. Excretion C. Which Toxic Substances Are the Most Hazardous? Why? 1. Heavy Metals and Synthetic Organic Compounds 2. Persistence 3. Ease of Absorption 4. Bioaccumulation
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Fig. 20.2 At each step or in transportation between steps, wastes, byproducts, or the product itself may enter the environment, causing pollution and creating various risks to human and environmental health. Fig. 20.3 In halogenated hydrocarbons one or more hydrogen atoms has been replaced by halogen atoms (chlorine, fluorine, bromine, iodine). Such compounds are particularly hazardous to health because they are nonbiodegradable and they tend to bioaccumulate. Shown here are tetrachloroethylene and 1,2-dibromo ethane.
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II. Management of Hazardous Wastes
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CHAPTER 19 - CHAPTER 19 HAZARDOUS CHEMICALS: POLLUTION AND...

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