{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

25 Lec 25 Soil pollution xenobiotics part 2

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

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
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)
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Xenobiotic Cycle in Soils Photo decomposition Adsorption Leaching Chemical decomposition Biological degradation Volatilization Surface runoff Plant absorption From Pierzynski et al. Soils and Environmental Quality. 2005.
Image of page 2
Volatilization Transfer from soil to atmosphere Great variability of organic chemical volatility From Pierzynski et al. Soils and Environmental Quality. 2005.
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 4
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
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern