Thermodynamics

Thermodynamics - Thermodynamics Introduction Entropy vs....

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Unformatted text preview: Thermodynamics Introduction Entropy vs. Enthalpy TS Arlene Hurricane Katrina (Cat 5) Thermodynamics Transport, transformation and effect(s) of an organic compound depend on which environmental compartment it settles in. Examples: Compounds can be transported long distances in air or water, but if they remain sorbed to organic matter, their movement is limited. (Like a Broken down Mac Truck) CCl 2 F 2 may undergo reductive dehalogenation in anaerobic aqueous environments, but due to its very high vapor pressure, it stays in the atmosphere, which is oxidative. Thus CCl 2 F 2 is very persistent and eventually reaches the stratosphere, where it causes ozone depletion. Thermodynamics Quantifies a compounds affinity for the environmental compartments which are available to it. Also implies the amount of energy necessary to move a chemical into a different compartment Can predict the direction of phase transfer Example: Are PBDEs absorbing into or volatilizing out of the water of the Hudson River Estuary? Does not tell us anything about kinetics of phase transfer Equilibrium is related to kinetics Simple reversible reaction dt dB B k A k dt dA =- =-- ] [ ] [ 1 1 At equilibrium, there is no change in concentrations: = =- dt dB dt dA thus ] [ ] [ 1 1 B k A k- = eq K k k A B = =- 1 1 ] [ ] [ Example: sorption of PCBs to organic matter. K eq is large, implying that sorption is fast and desorption is slow B A k k - 1 1 In addition,...
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Thermodynamics - Thermodynamics Introduction Entropy vs....

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