25 Lec 25 Soil pollution xenobiotics part 2

25 Lec 25 Soil pollution xenobiotics part 2 - I....

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Unformatted text preview: 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 + see 4 additional readings on bspace Degradation of xenobiotics Degradation of xenobiotics (part 2) (part 2) Xenobiotic Cycle in Soils Photo decomposition Adsorption Leaching Chemical decomposition Biological degradation Volatilization S u r f a c e r u n o f f Plant absorption From Pierzynski et al. Soils and Environmental Quality. 2005. Volatilization Transfer from soil to atmosphere Great variability of organic chemical volatility From Pierzynski et al. Soils and Environmental Quality. 2005. Adsorption / Desorption Very important in reducing mobility Common name Adsorptivity to soil colloids Dalapon None Chloramben Weak Bentazon Weak 2,4-D Moderate Propachlor Moderate Atrazine Strong Alachlor Strong EPTC Strong Diuron Strong Glyphosate Very strong Paraquat Very strong Trifluralin Very strong DCPA Very strong Adsorption of PCB by different soil materials Leaching and Runoff Concentration in the liquid phase (mg/L) 0.0001 0.001 0.01 0.1 1 10 100 1000 MTBE DEHP DDT pentachlorophenol 1,1,1-TCA tetrachloromethane chloroform dichloromethane PCE TCE trans-1,2-DCE cis-1,2-DCE 1,1-DCE vinyl chloride dibenz(a,h)anthracene benz(a)pyrene napthalene styrene benzene Concentration in the liquid phase (mg/L)...
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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 University of California, Berkeley.

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25 Lec 25 Soil pollution xenobiotics part 2 - I....

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