24 Lec 24 Soil pollution xenobiotics

24 Lec 24 Soil pollution xenobiotics - Degradation of...

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I. Xenobiotics 1. Definition 2. Types of compounds 3. Pesticides II. Processes affecting xenobiotics cycle in soils 1. Volatilization 2. Adsorption/desorption 3. Leaching/runoff 4. Abiotic transformations 5. Plant absorption 6. Microbial degradation III. Recalcitrance IV. Biodegradation 1. Metabolism and co-metabolism 2. Examples Reading : Textbook: Sylvia et al., 2004. Chapter 20 Degradation of xenobiotics Degradation of xenobiotics (part 1) (part 1)
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Accident Design Accident Neglect Soil pollution: The introduction of substances or organisms into the soil, resulting in a change of the soil quality, which is likely to affect the normal use of the soil or endangering public health and the living environment”
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Focus on organic contaminants Origins: - industrial activity - urban activity - agricultural activity Pesticides: most widespread organic pollutants associated with soils (used on some 150 million ha of land in US) Soil contamination by other organic chemicals is usually much more localized
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From greek xenos : stranger/foreign; bios : life Artificially synthesized compounds containing structures and bonds that do not occur in nature Xenobiotics
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Many are toxic for living organisms + resistant to biological decay Some are inert and harmless Others are toxic even in small concentrations Can find their way to soil, water, air or vegetation Xenobiotics
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Types of organic compounds 1. BTEX (benzene, toluene, ethylbenzene, xylene)
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This note was uploaded on 04/02/2010 for the course ESPM 131 taught by Professor Pallud during the Spring '10 term at Berkeley.

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24 Lec 24 Soil pollution xenobiotics - Degradation of...

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