Ch_24Organic_Chemicals_In_the_Environment

Ch_24Organic_Chemicals_In_the_Environment -...

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Organic Chemicals In the  Environment ENVS 4101 Environmental  Chemistry Portier
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The 12 Key POPs—the Dirty Dozen www.epa.gov/international/toxics/pop.htm. Persistent Organic Pollutants
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Chemical structures of (a) DDT; (b) TCDD and other dioxins;  (c) biphenyl and two PCBs that can be derived from it.
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Steroids all share the same basic four-ring structure.
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EPAs Priority Level-1 PBTs www.epa.gov/pbt. Priority Persistent, Bioaccumulative, and Toxic  (PBT) Pollutants 
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Remember???? The solvent octanol is used to mimic the behavior of humic  substances. (a) possible pollutants and octanol, (b) same pollutants and  humic substances.
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Sorption on Soils The sorption coefficient, Kp is defined as:  Kp =       Concentration solid phase        =       mg/kg       =     L            Concentration solution                 mg/L            kg
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Carbon-Normalized Sorption Coefficient The sorption coefficient, Kp can be calculated from the carbon  normalized sorption coefficient, Koc.  The Koc is defined as: Koc  =   Sorption Coefficient, Kp        Fraction Organic Carbon, foc To determine the soil organic carbon content at a site, samples are taken  back to the laboratory.  There, they are first acidified to dissolve and  remove the inorganic carbon (carbonates). Weighed samples of the soil  are then burned in an oxygen atmosphere and the CO2 produced is 
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Ch_24Organic_Chemicals_In_the_Environment -...

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